thermal expansion and contraction of the concret e Concrete floor supported on the ground with a separately poured edge strip footing. "Here's a photo of the floor you made for my cat. Where expansive materials are present, a suspended floor system should be used. Before the concrete can be poured in-situ to create the suspended first-floor concrete slab formwork and shuttering must be erected as follow: ... We specialize in tackling challenging projects, specializing in raft foundations, in-situ first-floor concrete slabs, beams, staircases, basements, retaining walls and concrete columns. In some areas, a gas membrane might be required to stop gases, such as radon, entering the living space and ventilation required to stop it colleting. pdf. Top notch! Construction Studies drawing detail of suspended timber floor. This picture shows a typical raft slab which would be used for a basement or garage floor. And technology has come to the rescue! The internal load bearing walls are called sleeper walls and are very often built with gaps in between the bricks to allow a free flow of air under the floor. A floor/sub-floor system must obviously be able to bear the entire load on top of it, potentially including the house, contents and occupants (some floor structures, such as upper floors, will only need to support the contents/occupants). Some slabs have hollow channels running through them - these 'hollow core slabs' are used to help reduce weight, and also to allow cabling and piping to be run through the slab. There are three key things that need to be considered when constructing or renovating a timber floor: We cover the building regulations for timber floors below in greater detail. The big spaces in the web means that it is very easy to run the services through – no more notching! The prestressing of a concrete floor slab can eliminate its usual deflection below … Download. Thanks so much for the superb floor! Stiffened raft slab. The big benefit for choosing a suspended floor (whether concrete or timber) is that the construction is simple. 5.2 Suspended ground floors This chapter gives guidance on meeting the Technical Requirements for suspended ground floors including those constructed from: in-situ concrete Suspended reinforced in-situ concrete ground floor slab supported on internal walls. A raft or island suspended ceiling system typically comprises of items such as ceiling support, support fasteners and ceiling type. For more details on building strip foundations see our project here. We have a joist notch calculator here to make calculating where you can notch easier. 15 2-1 CHAPTER 2 BASIS OF FLOOR SLAB ON GRADE DESIGN 2-1. Concrete suspended slabs spans between walls, columns or other supports. All project content written and produced by Mike Edwards, founder of DIY Doctor and industry expert in building technology. 5.1 - D11. Concrete Suspended Slab. Creak is also caused by the joists twisting and warping over time. Rather than having an engineered chipboard web between the two flanges, this type of joist have lightweight metal struts. They are normally pre-fabricated offsite, and transported by truck. Suspended Concrete Slab. In-situ concrete suspended ground floors Published: 22 October 2020. pdf. You should read the full regulations which you can find here. suspended floors. Radon protection - provision of sump Published: 22 October 2020. The big benefit for choosing a suspended floor (whether concrete or timber) is that the construction is simple. How a Suspended Timber Floor is Constructed. Have a look at our project on filling gaps in floorboards. Stresses. Refer to ACI 223 for procedures for the design and construction of shrinkage-compensating concrete slabs-on-ground. RIW/TD/101 Typical detail at bottom of masonry retaining wall over raft slab. One of the problems that timber joists have is that they have a limited span and can be prone to twisting and warping (causing the creaking described above). Many buildings with suspended timber floor suffer from rot and insect attack in the ground floor timbers due to poor sub floor ventilation. Suspended floors. Keep up to date with our DIY projects, tips and latest deals, © DIY Doctor Ltd 2021 All Rights Reserved. There are a number of enhanced options to replace simple timber floor joists.eval(ez_write_tag([[250,250],'diydoctor_org_uk-incontent_5','ezslot_21',688,'0','0'])); These are engineered wooden joists which have been designed to be much stronger for their size and weight so that they can span greater distances. We design, supply, deliver and install first-floor & reinforced suspended slab concrete products for customers in Pretoria, Johannesburg and the greater Gauteng regions. RIW/TD/151 Typical detail at top of retaining wall . Let us help you find a tradesman local to you. To stop this happening the regulations stipulate that there should be a layer of concrete poured over the ground. A suspended timber floor on sleeper walls – Image courtesy of retrofitproject.co.uk. Concrete floor supported on the ground with a separately poured edge strip footing. The slab is built above-ground level suspended in the air and is not connected to the earth. Raft foundations - edge detail ... Download. DPMs should be properly lapped in accordance with Chapter 5.1 ‘Substructure and ground-bearing floors’. Download. This stops any build up of condensation and is assisted by building in airbricks through the external walls. Whether building a ground floor suspended timber floor or a first floor hollow floor, we explain the different options and techniques that you can use in its construction. The following is a summary of the regulations that apply to suspended floors. 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