There are two basic ways to make the floors of a building. 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. This insulates the floor, but still allows some air to circulate, preventing the timber from getting damp and rotting. Fig 2 shows the side view of the sleeper walls with the bricks arranged to allow air movement. If I find out anything more, I’ll put it on the blog, so stay tuned! Standard rigid board insulation is typically laid on top of the floor, with new flooring add above this. A solid Floor is much simpler and cheaper. The Old Engineer says: A beam on an elastic foundation (“slab on grade”) must be designed to withstand the maximum bending moment. “Ground Floor” is just above GL & “ Basement Floor” is constructed below GL in one basement of a building. However this air flow can leave the problem of draughts and cold in the house if not insulated correctly. Insulation is usually added only during major refurbishment work. These cookies do not store any personal information. NZS 3604 sets a minimum height above ground for wood-based products used for flooring. If there is extensive refurbishment work happening however, it may be a good time to look at floor insulation. 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. Suspended ground floors – where the slab is supported on beams and/or loadbearing sleeper walls and is not in direct contact with the ground. We often get asked whether you should insulate floors between levels, as well as the ground floor. If you are doing it to improve the energy efficiency only, then intermediate level insulation will not have any value. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. How to insulate suspended timber floors. More expensive 2. Because the Floor is suspended above the ground, it should absorb less moisture than a solid floor. Basement or ground floors – the concrete slab is directly supported onto a construction which may involve hardcore, blinding and other materials. Suspended concrete floors Typical block and beam floor Quick and cheap to install Inverted ‘ T’ shaped beams Concrete blocks placed in between them 7. As verbs the difference between floor and ground is that floor is to cover or furnish with a floor while ground … Your email address will not be published. Block and beam floors are a very popular type of suspended floor. Comment below to get your voice heard…. 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. The insulation must be strong and waterproof. 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. Floors may be stone, wood, bamboo, metal, or any other material that can hold a person's weight. First thing is that the slabs are the structural members generally made up of cement concrete or reinforced cement concrete. Raising the floor level up above the ground acts as a barrier to damp coming up from the ground. 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. 1. © Copyright 2006-2020 - All rights reserved. Suspended Concrete Slab. 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. In older properties (pre 1910), air bricks were not always fitted - in such properties, they should be retro fitted where possible. 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. 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. Millions of properties have suspended timber ground floors globally, with around ten million in the UK alone. Floors vary from simple dirt in a cave to many-layered surfaces using modern technology. The cross-sectional area of the steel, the spacing of the steel and tensile … Structural steel may be rebar or WWF. A: A structurally reinforced slab-on-ground uses a composite of concrete and structural steel to support the design load. 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 What’s required to laterally support ends of floor joists? Air bricks through the outer walls, facilitate air movement. 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. 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. A continuous damp proof course must be laid beneath the beams. Do you have a different opinion? Floor insulation can get expensive, simply because how disruptive it is. 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. 2. Requires machinery to lift heavy beams Advantages: 1. Hi, the house is Edwardian with the floors suspended on concrete/brick pillars and wooden joist of 150mm width. There are still be many suspended floors out there however, because retrofitting them is prohibitively expensive and often impractical. “ Upper/Suspended Floor” is any floor above the GL except the terrace or roof of building. We also use third-party cookies that help us analyze and understand how you use this website. Learn more about construction procedure with video explanation. Slab on ground is the preferred option on a flat site due to speed and economies. Non-suspended slabs sit directly on the ground. This category only includes cookies that ensures basic functionalities and security features of the website. This website uses cookies to improve your experience while you navigate through the website. Think we missed something? Some types of concrete slabs may be more suitable to a particular site and climate zone than others. 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. 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. Necessary cookies are absolutely essential for the website to function properly. The gap between joist is 300-350mm. Upgrading floors changes the void conditions, which might increase or decrease moisture build-up and mould and fungal growth. Slabs are also use to construct the floors which are known as the ‘floor slabs’. 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. There are a few ways to insulate a suspended floor, but the best, most breathable way is to hang insulation under the floorboards. Different types of ground floor suspended flooring . Insulating a suspended timber floor can eliminate floor draughts and reduce heat loss through the fabric of the floor at the same time. There are two different types Supported slab on grade and monolithic slab on grade. 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 ply spanned two/three joists and screwed down every 8-9 inches. You can either have a concrete base or a suspended floor, usually made out of timber. 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. Temporary Roof & Floor Holes, Wall Openings, Stairways Safety Requirements for, & Other Unprotected Edges in Construction & Demolition Operations. Buy our books at a local store,, or Barnes& Suspended Floor Suspended Floor: A suspended floor is one that is suspended above the ground. Slabs which are directly laid on the earth to support walls and other structural elements are called as Slab on grade or Grade Slabs. This allows air flow and ventilation to prevent the mould and dry rot that would otherwise occur over damp ground. Furthermore, the insulation will help prevent heat moving from a room that has been heated to another where the heating is off. It rests on beams spanning between supporting walls. Cold ground floors These cookies will be stored in your browser only with your consent. Thermal insulation is used for both ground bearing and suspended floors. So we will discuss Concrete or Timber floor systems. In this blog, we are going to look at some of the implications of this type of house. The phrase “ground floor,” of course, refers to the floor of a building closest to the ground. 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. Because of this cost, it is usually not worth it to insulate your floors. 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. The slabs needs to be of low conductivity material, so that the thickness of the insulation can be reduced. This type of concrete slab construction requires different concrete slab design from the one we normally see that is cast on the ground. Unlike standard ground floor construction, suspended floors are not sitting directly on the ground. It is not possible to lay insulation underneath a solid floor, so any insulation will need to go on top. We had the wet UFH put in between the joists with the insulation then the 18mm plywood. You also have the option to opt-out of these cookies. 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. Not only do they refer to the floor as the ground, but they call the ground the floor. But opting out of some of these cookies may affect your browsing experience. 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. ... Safety Requirements for Work Platforms Suspended from Cranes or Derricks. Floor is a see also of ground. Quick to construct 2. 26 Disadvantages: 1. Suspended slab formwork and rebar in place, ready for concrete pour. Ground : - Ground may refer to Earth's surface where the floor is build up. Would you consider concrete slabs suspended as it will have positives of both builds. Suspended slabs differ from non-suspended slabs because they are suspended above the ground via beams. 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). 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. The floor of any size of room can, in theory, be constructed using sleeper walls as the joists are supported along their length. Suspended slab under construction, with the formwork still in place. 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. At least so far, dictionaries maintain the distinction between the two words. It consists of solid concrete built into the ground. The floor right on top of the ground is called a ground bearing floor while everything else is suspended. 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. Suspended concrete slab is referred to a cement slab that is not in contact with the ground. These gaps may occur around pipes. out the requirements for suspended floors. 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. Because both the upstairs and downstairs are being heated, there is no heat transfer between levels and therefore no energy saving to be made. 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. Floor levelness (F L) controls the departure of the floor surface from the specified slope or plane of the surface. Such floors are named as 1st Floor, 2nd Floor and so on (in ascending order). The answer to this is that it really depends on the reason for insulating. Suspended Timber Floor. Difference Between : - Floor: - A floor is the walking surface of a room . Save my name, email, and website in this browser for the next time I comment. Unfortunately, a consequence of this is that the floors can be quite draughty, with air bricks required to keep the timber dry. 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. There are still be many suspended floors out there however, because retrofitting them is prohibitively expensive and often impractical. Infill blocks to be standard solid light aggregate/concrete 440 x … A typical suspended floor is shown below in Fig 1 with the joists resting on sleeper walls at right angles. Timber floors were originally designed to prevent damp. And the expression “getting in on the ground floor” means joining a venture at an early, advantageous time. ANSI/ASSP A10.31-2019 Safety Requirements, Definitions and Specifications for Digger Derrick. Beam and Block for Ground and Upper Floors Beam and Block for Ground Floors. 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. a "floating" floor has been installed; Gaps between flats. This website uses cookies. It is mandatory to procure user consent prior to running these cookies on your website. A minimum void of 150mm must be provided between the soffit of the floor and the solum. 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. These days most homes are designed with concrete floors because damp proofing technology allows us to create a dry floor without an air gap. There are a few ways to insulate a suspended floor, but the best, most breathable way is … The savings are actually fairly modest compared to insulating other parts of the home, like the walls and loft. Suspended slab may be the most expensive compared to … Suspended floors are normally made up of 2 materials, either timber joists or a concrete beam system. Type 1: Suspended Floors Suspended timber floors are normally made up of timber joists Services. 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.

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