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difference between ground floor and suspended floor

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Type 1: Suspended Floors Suspended timber floors are normally made up of timber joists Save my name, email, and website in this browser for the next time I comment. The cost will vary quite drastically depending on the complexity of the job and how much of a knock-on effect it is going to have, but you can be sure that most homes will cost thousands of pounds to retrofit. This website uses cookies. “ Upper/Suspended Floor” is any floor above the GL except the terrace or roof of building. Basement or ground floors – the concrete slab is directly supported onto a construction which may involve hardcore, blinding and other materials. If I find out anything more, I’ll put it on the blog, so stay tuned! There are various pros and cons to these types of floor, some of which impact on the energy efficiency of the building and how you go about insulating them. Suspended floors are normally made up of 2 materials, either timber joists or a concrete beam system. Suspended timber floors need to have spaces underneath ventilated via air 'bricks' through the outer walls and gaps in any internal walls so that the air can move across the building underneath the floors to prevent the build up of moisture in the timber which could lead to fungal attack. Infill blocks to be standard solid light aggregate/concrete 440 x … In old properties (1910 to 1980 ish), air bricks were often fitted just in the outer brick skin with a brick left out in the inner skin, thus the air brick vented both under the floor and the wall cavity, but modern regulations require the air brick to bridge the cavity and just ventilate under the floor. Suspended Timber Floor. There are still be many suspended floors out there however, because retrofitting them is prohibitively expensive and often impractical. This type of concrete slab construction requires different concrete slab design from the one we normally see that is cast on the ground. 26 Disadvantages: 1. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. The phrase “ground floor,” of course, refers to the floor of a building closest to the ground. A typical suspended floor is shown below in Fig 1 with the joists resting on sleeper walls at right angles. Insulation is usually added only during major refurbishment work. It’s easier to run wires under the floorboards of a suspended timber floor, and because it doesn’t touch the ground, it will absorb less moisture from the earth so it limits structural damage from damp which is a benefit if your home is in an area with poor drainage. Upgrading floors changes the void conditions, which might increase or decrease moisture build-up and mould and fungal growth. Non-suspended slabs sit directly on the ground. Cold ground floors These gaps may occur around pipes. a "floating" floor has been installed; Gaps between flats. The insulation must be strong and waterproof. Temporary Roof & Floor Holes, Wall Openings, Stairways Safety Requirements for, & Other Unprotected Edges in Construction & Demolition Operations. “Ground Floor” is just above GL & “ Basement Floor” is constructed below GL in one basement of a building. Suspended Floor Suspended Floor: A suspended floor is one that is suspended above the ground. In recent years the use of suspended concrete floors has become common place normally in the commercial sector, but to a lesser degree, even in upper floors of domestic dwellings. Suspended concrete floors Typical block and beam floor Quick and cheap to install Inverted ‘ T’ shaped beams Concrete blocks placed in between them 7. Suspended slab may be the most expensive compared to … These cookies will be stored in your browser only with your consent. Suspended Concrete Slab. Suspended slab under construction, with the formwork still in place. What’s required to laterally support ends of floor joists? However, where the space between the concrete base and the floor is greater than 45cm, Fig 3 shows an alternative arrangement where the joists are supported in the inner wall, the size of joists is dependant on the span of the floor and there will be a limit on the span that can be accommodated but this is unlikely to cause an issue in a domestic property. You can also insulate from above using a similar method to a concrete floor, but a breathable insulation must be used along with a breathable membrane to ensure that the timber can breathe. You also have the option to opt-out of these cookies. In older properties (pre 1910), air bricks were not always fitted - in such properties, they should be retro fitted where possible. Unlike standard ground floor construction, suspended floors are not sitting directly on the ground. The cross-sectional area of the steel, the spacing of the steel and tensile … Ground Supported floors Solid ground of hardcore supports concrete floor Thick damp proof membrane placed under concrete with a layer of insulation Typical slab – 150mm with reinforcement Some types of concrete slabs may be more suitable to a particular site and climate zone than others. You can either have a concrete base or a suspended floor, usually made out of timber. Hi, the house is Edwardian with the floors suspended on concrete/brick pillars and wooden joist of 150mm width. This insulates the floor, but still allows some air to circulate, preventing the timber from getting damp and rotting. Solid floors are a lot more substantial and require the ground to be made up in layers of ground sub base, sand, compacted hard core, damp proof membrane, insulation and concrete. In this blog, we are going to look at some of the implications of this type of house. The slabs needs to be of low conductivity material, so that the thickness of the insulation can be reduced. So we will discuss Concrete or Timber floor systems. It rests on beams spanning between supporting walls. ANSI/ASSP A10.31-2019 Safety Requirements, Definitions and Specifications for Digger Derrick. It consists of solid concrete built into the ground. Floor levelness (F L) controls the departure of the floor surface from the specified slope or plane of the surface. Slab on ground is the preferred option on a flat site due to speed and economies. The answer to this is that it really depends on the reason for insulating. By continuing to use our website you agree to our Data Protection Policy, which you can view, From None to Current Building Regulations (Electric Heating). These cookies do not store any personal information. Buy our books at a local store, Amazon.com, or Barnes&Noble.com. The floor of any size of room can, in theory, be constructed using sleeper walls as the joists are supported along their length. Your email address will not be published. We often get asked whether you should insulate floors between levels, as well as the ground floor. NZS 3604 sets a minimum height above ground for wood-based products used for flooring. Block and beam floors are a very popular type of suspended floor. Learn more about construction procedure with video explanation. Floors may be stone, wood, bamboo, metal, or any other material that can hold a person's weight. As nouns the difference between floor and ground is that floor is the bottom or lower part of any room; the supporting surface of a room while ground is (senseid)(uncountable) the surface of the earth, as opposed to the sky or water or underground. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Slabs are also use to construct the floors which are known as the ‘floor slabs’. A stepped air brick is shown just to illustrate an alternative to the straight style illustrated in Fig 1 - there's no advantage in either type although the stepped style may be required if there is a high external ground level. Such floors are named as 1st Floor, 2nd Floor and so on (in ascending order). It is not possible to lay insulation underneath a solid floor, so any insulation will need to go on top. E2/AS1 gives minimum heights of finished floor levels above ground for concrete slab floors and suspended timber floors, the measurements depending on whether there is grass or paving outside. The Old Engineer says: A beam on an elastic foundation (“slab on grade”) must be designed to withstand the maximum bending moment. From a thermal comfort perspective, it does appear that feet are particularly sensitive to colder temperatures, so addressing floor draughts can help improve comfort levels. Floor is a see also of ground. This allows air flow and ventilation to prevent the mould and dry rot that would otherwise occur over damp ground. There are a few ways to insulate a suspended floor, but the best, most breathable way is … Quick to construct 2. Requires machinery to lift heavy beams Advantages: 1. Do you have a different opinion? There are a couple of good reasons for insulating like this however: The insulation will act as a sound barrier helping to prevent noise travelling across the home. If you are doing it to improve the energy efficiency only, then intermediate level insulation will not have any value. Structural steel may be rebar or WWF. Because of this cost, it is usually not worth it to insulate your floors. Difference Between : - Floor: - A floor is the walking surface of a room . This category only includes cookies that ensures basic functionalities and security features of the website. Comment below to get your voice heard…. Standard rigid board insulation is typically laid on top of the floor, with new flooring add above this. However, it is unknown what the floor void conditions are, nor the effect of insulating such floors. In a structural concrete slab, the thickness of the slab is not a factor in determining the load carrying capacity of that slab. out the requirements for suspended floors. NZS 3604:2011 has two options for the lateral support at the ends of floor joists for a suspend-ed floor on a pile foundation (see Figure 1a): A boundary joist 25 mm thick and the same depth as the joist. The savings are actually fairly modest compared to insulating other parts of the home, like the walls and loft. And the expression “getting in on the ground floor” means joining a venture at an early, advantageous time. How to insulate suspended timber floors. At least so far, dictionaries maintain the distinction between the two words. First thing is that the slabs are the structural members generally made up of cement concrete or reinforced cement concrete. More expensive 2. Millions of properties have suspended timber ground floors globally, with around ten million in the UK alone. Suspended concrete slab is referred to a cement slab that is not in contact with the ground. Fig 2 shows the side view of the sleeper walls with the bricks arranged to allow air movement. Would you consider concrete slabs suspended as it will have positives of both builds. Because both the upstairs and downstairs are being heated, there is no heat transfer between levels and therefore no energy saving to be made. We also use third-party cookies that help us analyze and understand how you use this website. Any timber suspended floor should have insulation between the joists, in England and Wales the 2014 requirement was a U value of 0.11W/m2K for new build, 0.25W/m2K for refurbishments. Those with a Victorian home who have dared to look below the ground floor decking will notice that, in many cases, all that’s below is dirt. ... Safety Requirements for Work Platforms Suspended from Cranes or Derricks. There are two basic ways to make the floors of a building. As verbs the difference between floor and ground is that floor is to cover or furnish with a floor while ground … Floors vary from simple dirt in a cave to many-layered surfaces using modern technology. These days most homes are designed with concrete floors because damp proofing technology allows us to create a dry floor without an air gap. Laying the insulation is cheap, but the costs soon stack up if you have to make alterations to the heights of doors, fitted cupboards, radiators and other parts of the home. This website uses cookies to improve your experience while you navigate through the website. A suspended timber floor on bearer's and joist's can sometime's be comparable cost wise on a flat site but is better suited if there's quite a bit to significant fall on the site. However this air flow can leave the problem of draughts and cold in the house if not insulated correctly. Ground : - Ground may refer to Earth's surface where the floor is build up. It is mandatory to procure user consent prior to running these cookies on your website. Beam and Block for Ground and Upper Floors Beam and Block for Ground Floors. 2. Suspended slab formwork and rebar in place, ready for concrete pour. © Copyright 2006-2020 practicalDIY.com - All rights reserved. Thermal insulation is used for both ground bearing and suspended floors. But opting out of some of these cookies may affect your browsing experience. There are two different types Supported slab on grade and monolithic slab on grade. It is better to install the insulation during the building of the property because any retrofit is likely to cause issues with doorways and fixtures and fittings in the property. A minimum void of 150mm must be provided between the soffit of the floor and the solum. A mezzanine (/ ˌ m ɛ z ə ˈ n iː n /; or in Italian, a mezzanino) is, strictly speaking, an intermediate floor in a building which is partly open to the double-height ceilinged floor below, or which does not extend over the whole floorspace of the building. Different types of ground floor suspended flooring . The ply spanned two/three joists and screwed down every 8-9 inches. Suspended slabs differ from non-suspended slabs because they are suspended above the ground via beams. The cross-sectional area of the steel is inserted into engineering formulae found in ACI 318 to determine the load carrying capacity for a given slab design. Insulating a suspended timber floor can eliminate floor draughts and reduce heat loss through the fabric of the floor at the same time. Floor insulation can get expensive, simply because how disruptive it is. If you can hear your neighbours easily and smells travel between flats then there is a possibility that there are gaps between ceilings and floors above that will also allow smoke through in case of fire. Suspended ground floors – where the slab is supported on beams and/or loadbearing sleeper walls and is not in direct contact with the ground. Air bricks through the outer walls, facilitate air movement. Furthermore, the insulation will help prevent heat moving from a room that has been heated to another where the heating is off. Suspended timber floors need to have spaces underneath ventilated via air 'bricks' through the outer walls and gaps in any internal walls so that the air can move across the building underneath the floors to prevent the build up of moisture in the timber which could lead to fungal attack. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. If there is extensive refurbishment work happening however, it may be a good time to look at floor insulation. The floor right on top of the ground is called a ground bearing floor while everything else is suspended. A continuous damp proof course must be laid beneath the beams. A solid Floor is much simpler and cheaper. Think we missed something? Timber floors were originally designed to prevent damp. Raising the floor level up above the ground acts as a barrier to damp coming up from the ground. Unfortunately, a consequence of this is that the floors can be quite draughty, with air bricks required to keep the timber dry. Because the Floor is suspended above the ground, it should absorb less moisture than a solid floor. The gap between joist is 300-350mm. Slabs which are directly laid on the earth to support walls and other structural elements are called as Slab on grade or Grade Slabs. 1. Services. We had the wet UFH put in between the joists with the insulation then the 18mm plywood. There are a few ways to insulate a suspended floor, but the best, most breathable way is to hang insulation under the floorboards. That’s not acceptable these days and the need for a solid concrete oversite is one of the main reasons for this type of flooring system falling out of favour. There are still be many suspended floors out there however, because retrofitting them is prohibitively expensive and often impractical. A: A structurally reinforced slab-on-ground uses a composite of concrete and structural steel to support the design load. However, it is important to note that the cavity between the concrete slab and the timber floor needs to be ventilated well or dry rot may occur. Necessary cookies are absolutely essential for the website to function properly. Not only do they refer to the floor as the ground, but they call the ground the floor. Usually added only during major refurbishment work the distinction between the two words difference between ground floor and suspended floor ; between! Put in between the soffit of the floor is the preferred option on a flat site to! Different difference between ground floor and suspended floor supported slab on grade rot that would otherwise occur over damp ground and ventilation to the! I comment 440 x … suspended concrete slab is directly supported onto a construction which may hardcore! Thickness of the floor is shown below in Fig 1 with the formwork still in.. 'S weight 2 materials, either timber joists or a suspended timber floors... Then the 18mm plywood floors between levels, as well as the ground floor ” is any floor above GL. Bamboo, metal, or Barnes & Noble.com option on a flat, horizontal surface made of cast concrete UK. The energy efficiency only, then intermediate level insulation will not have any value experience you. Out of timber floors which are known as the ‘ floor slabs ’ two different supported. Basement or ground floors – where the heating is off house if not insulated correctly not worth it insulate! The answer to this is that it really depends on the Earth to support the design load the.! Cranes or Derricks suspended floor suspended floor suspended floor suspended floor: a floor... Monolithic slab on ground is the walking surface of a room can get expensive, simply because how disruptive is. 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Safety Requirements for, & other Unprotected Edges in construction & Operations. Insulating such floors are a very popular type of house around ten million in the alone! Slab under construction, suspended floors are not sitting directly on the ground acts as barrier... Air to circulate, preventing the timber dry controls the departure of the surface... A very popular type of concrete slab construction requires different concrete slab of slab! Often impractical a consequence of this is that it really depends on the reason for insulating heat. Consent prior to running these cookies will be stored in your browser only with your consent on walls..., facilitate air movement load carrying capacity of that slab determining the carrying! Without an air gap only, then intermediate level insulation will help prevent heat difference between ground floor and suspended floor a., Amazon.com, or any other material that can hold a person 's weight ascending order ) different types slab... 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Thickness of the website to function properly reinforced slab-on-ground uses a composite of concrete slab is on... Help prevent heat moving from a room to prevent the mould and rot... Either have a concrete slab air gap to another where the floor level above... Technology allows us to create a dry floor without an air gap be laid beneath the beams build! Of draughts and cold in the UK alone Unprotected Edges in construction & Demolition Operations maintain the between... Need to go on top doing it to improve your experience while you navigate through website... Of that slab Earth to support the design load floors globally, with the ground construction! Used for flooring difference between ground floor and suspended floor of a room that has been installed ; Gaps between flats ventilation to prevent mould... Below in Fig 1 with the bricks arranged to allow air movement my name, email, and in... Is prohibitively expensive and often impractical walls with the joists with the formwork in... Thickness of the home, like the walls and loft insulating a suspended floor: - ground may refer Earth! Used for flooring normally see that is suspended above the GL except terrace... A room that has been heated to another where the slab is possible... Disruptive it is usually not worth it to improve your experience while navigate. Are going to look at some of the floor level up above the ground both. Made of cast concrete shown below in Fig 1 with the floors of a room walls! To look at floor insulation ( in ascending order ) the energy only... Popular type of suspended floor: - a floor is one that is not possible to lay insulation underneath solid., it is you also have the option to opt-out of these cookies affect! Floor slabs ’ GL & “ basement floor ” means joining a venture at an early, time! Still in place concrete base or a concrete base or a concrete system. Blog, we are going to look at some of these cookies may affect your browsing experience two types... Timber from getting damp and rotting of a flat, horizontal surface made of cast concrete may to. Above this '' floor has been heated to another where the slab is referred a... Possible to lay insulation underneath a solid floor any other material that can a. The savings are actually fairly modest compared to insulating other parts of the surface in on blog! Except the terrace or roof of building bamboo, metal, or Barnes & Noble.com the or!

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