He will know what is required and what is usual practice in your area (including familiarity with soil, water table etc) PARTS OF A SUSPENDED TIMBER FLOOR The suspended timber floor involves the over site concrete slab, honey combed sleeper walls, wall plates and floor joints The diagram of figure two shows the linkages between the various components of the floor The examination of the illustration can help you to identify the functions of the various parts Suspended Timber Ground Floors consist of the finished timber floorboards being attached to floor joists, which are suspended above the subfloor of the foundation These floor joists are raised above the subfloor on small supporting walls called tassel walls (or sleeper walls) Click to see full answer
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What is a suspended timber floor-Tyvek® membranes are ideal for suspended timber floor construction They are vapouropen, yet greatly reduce air flow when correctly installed This helps to minimise underfloor condensation (and hence the risk of mould or decay) while improving the thermal efficiency of your floor and building Achieving AirtightnessSuspended timber floor showing internal isolated piers Minimum sizes and spacing for timber members for the floor can be found in AS 1684 – Residential Timber Framed Construction Acceptable Standards of Construction diagram below shows the arrangement of a metal frame
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Raised Floor Framing Diagram ©Don Vandervort, HomeTips What Are Floor Joists?A suspended floor is a ground floor with a void underneath the structure The floor can be formed in various ways, using timber joists, precast concrete panels, block and beam system or cast in Timber deck finish can also be used – if this is specified a vapour control layer must be included in the design under the timber deck A void is left under the floor of at least 150mm between the soil and underside of the beam If heavy clay soil is present it is good practice to increase the void depth to as much as 225mm or possibly more
Upperfloor suspended timber floors are built in a similar way although the floor joists may be designed so that they form part of the roof truss, in an attic for example A suspended timber strip floor in a newly built house has been painted and stencilled to look like tiles But you can still see the strips of wood#09 • Timber Flooring Design Guide Page 6 1 Timber Flooring and Floor Finishes 11 Movement in Timber Floors Prior to discussing timber flooring products, it is important to understand the relationship between timber, humidity in the air surrounding it and the dimensional changes that occur as the result of changes in humidityFloorCeiling Assemblies Here, you can find drawings for our UL firerated floor assemblies and UL firerated ceiling assemblies Our range of drawings can help pros plan projects more effectively by utilizing designs for a firerated ceiling assembly
Suspended Floors All you need to know What are they?Many buildings with suspended timber floor suffer from rot and insect attack in the ground floor timbers due to poor sub floor ventilation We look at this more thoroughly in our air bricks and air vents project , but quite simply if air bricks become blocked with debris or ground levels are raised this cuts off the air flow and water leaks may also occur Guidance for insulating suspended timber floors We use some essential cookies to make this website work We'd like to set additional cookies to understand how you use GOVUK, remember your
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Another benefit to wood screws is that they help to prevent squeaks and bumps on the floor I like to place the screws about 8 inches apart, to give a uniform look and for stability Where two pieces of plywood butt up against each other, I put two screws on each piece of plywood, right next to each other to prevent any liftingConstruction Studies drawing detail of suspended timber floor Suspended timber floors are very difficult to survey on a pre purchase survey, if the surveyor isn't able to lift any floorboards to inspect the sub floor Lots of properties now have laminate floor coverings, or vinyl floor coverings stuck down in kitchens, or even tiled, which no vendor would wish to lift to facilitate a full sub floor investigation
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With a precast floor, you have little option but to hang a suspended ceiling below the floor Timber joists can be drilled out or chipped away (with caution) but it is not straightforward Step forward the timber Ijoist and its cousin, the posijoistSuspended concrete floor The construction of suspended concrete floors is similar to that of timber but can span greater distances, and offerings better sound insulation properties A simple reinforced concrete flat slab is not usually economical as a suspended floor spanning over 5 mA floor's framework is made up mostly of wooden joists that run parallel to one another at regular intervals Floor joists are typically 2 by 8s, 2 by 10s, or 2 by 12s;
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Diagrams of how underfloor heating is fitted in various floor constructions You will note that we do not use metal plates with our system Metal plates can double the cost of your underfloor heating materials in one fell swoop, and to be honest, they are unnecessary to achieve heat transfer Suspended timber floor insulation will help you keep the desired temperature in your house all year round, saving it against cold in winter season and excess heat in summer season A wellinsulated house is very energy efficient and it will require very little additional heating and cooling according to requirement Floor structures are generally one of two types – solid or suspended Suspended timber floors, which are typically found in older houses, are normally made from timber floorboards which are then attached to joists just above the foundations of a house This creates a small gap and allows ventilation and air movement to prevent damp forming in
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Ceiling joists are usually 2 by 6s or sometimes 2 by 4s if it is an older homeBeam and joist floor frames can be constructed on site or off site and transported in, depending on your foundation The wood is water and weatherproofed first, and may be termite proofed as well when needed The beams are laid down, grooves are cut in and the joists are then fitted in Joists should only ever meet each other over the middleFor suspended timber floors, insulation is generally placed between the floor joists In this case the insulation shall be placed in full contact with the underside of the floor deck and fit tightly to the sides of the rafters The insulation should be supported at the design depth to prevent slumping The air barrier must also be continuous
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Suspended floors The BRANZ Technical Helpline often receives queries for designing and building suspended timber floors and dealing with uplift Nine of the most common questions are answered here Figure 1 Suspended timber floorMineral wool or similar can be used for upper floors, but all through draughts between the joists must be eliminated Photo Underfloor heating installed between the joists Suspended timber floor construction diagram GalleryBest practice for insulating a suspended timber floor – part 2 Question I'm 70% of the way through an eco retrofit of a 1940s bungalow (windows already in place) but still have about 30 m 2 of suspended timber floor to insulate and air seal I
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Insulating Floors in Historic Buildings This page provides advice on improving the thermal performance of floors by adding insulation The majority of older buildings have either a suspended timber floor or a solid floor which might have a finish such as tiling or stone Often these types of floor are used in different parts of the same buildingThis timber subfloor was built to lift the bearers off the ground and create a level surface on which to build the shed Shed Floor Deck The deck is the flat surface that forms the wooden shed floor that you walk on The material must be strong, able to span between the floor bearers/joists and be resistant to occasional damp Yep, plans show a solid concrete floor, builder built suspended timber From at least one thread here I understand building control can specify suspended timber despite plans to the contrary ps The BCO will be a good source;
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A suspended timber floor with the flooring lifted to expose the sleeper walls – Image courtesy of myretrofitblogspotcom Suspended, hollow or timber floors also have a tendency to creak as the nails work loose over time The answer to this problem can also be found in our project about stopping creaking floors and stairsOne of, if not the most important of which, is floor construction Underfloor heating can be fitted in both concrete and timber suspended floors, but for other floor constructions (for example we also offer a 'floating floor' solution) please contact us Also, note that we can offer many different floor constructions Heat losses from suspended timber floors laboratory experiments measuring heat losses through flooring utilizing a variety of insulation and ventilation rates to determine appropriate strategies for retrofitting insulation Build Res Inf, 25 (4) (1997), pp
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Construction details should be in accordance with AS Residential TimberFramed Construction A maximum roof pitch of 25 degrees is assumed TECHNICAL DIAGRAM Span Tables F7 Rafters ON PAGE 35 – 30mm M AXIMUM ALLOW ABLE SP ANS (mm) Sheet Roof Spacing (mm) Rafter Size 600 760 900 1000 10 66 x 30 1250 1150 1050 1000 950 90 x 30 1650This chapter gives guidance on meeting the Technical Requirements for suspended ground floors including those constructed from insitu concrete precast concrete timber joists 521 Compliance 522 Provision of information 523 Contaminants3 On your diagram, draw the correct positions of all overhead lights, air vents, columns, and/or other fixtures the ceiling must accommodate 4 Plot main framing lines on the diagram Draw the room centreline which is parallel to the long walls and perpendicular to the joists of the floor above
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A Best Practice Approach To Insulating Suspended Timber Floors Fintan from our Technical Team discusses the thermal loss issues associated with suspended timber floors and outlines a best practice approach to tackling them At the turn of the 18th century, when construction techniques moved from boarded floors installed directly on the groundHydronic floor heating is a great option for large, open entertaining areas It works well under cold floor coverings such as marble, stone, slate, polished concrete, and all varieties of tiles It may also be used under carpet and timber floors We recommend inquiring with timber manufacturers before the installation, which we can help facilitateDifferent types of ground floor suspended flooring 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
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Before choosing underfloor heating, many factors need to be considered;Insulating Suspended Timber Floors As indicated above not all suspended timber fl oors require insulation and enclosing sub fl oor spaces in mixed climates may be suf fi cient to reduce heat loss to acceptable levels However, in cool and also some other climates fl oors require insulation4 Ground supported floor – construction 25 5 Suspended timber floor – construction 26 6 Suspended floor – preventing water collection 26 7 Typical floors exposed from below 28 8 Dampproof courses 30 9 Protecting inner leaf 30 10 Protection of wall head from precipitation 31 11 Insulated external walls examples 33 12
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Suspended timber floor As a requirement of the Building Regulations the structure should be protected against the growth of weeds and other plantlife The ground should have a layer of concrete poured across and there should be a ventilated gap of at least 150mm between the underside of the timbers and the concrete, to prevent moisture gathering and affecting theSuspended Timber Ground Floors consist of the finished timber floorboards being attached to floor joists, which are suspended above the subfloor of the foundation These floor joists are raised above the subfloor on small supporting walls called tassel walls (or sleeper walls)If you've ever found yourself scratching your head when it comes to suspended floors, this article might be just the help you need The following are nine of the most common questions BRANZ's Technical Helpline receives about designing and building suspended timber floors and dealing with uplift 1What's required to laterally support ends of floor
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Suspended timber floors are normally made up of timber joists suspended from bearing walls, which are then covered with either floor boards or high quality sheets of tongue and groove To a degree this type of floor can give more comfort when your intention is to carpet the floor, when the floorTo contribute positively to thermal performance, the underside of suspended floors, including subfloor spaces, must be insulated if externally exposed (see Insulation) Lightweight suspended concrete floor systems are competitive in cost with timber and steel framed floors, and can reduce site impacts where a slab floor is preferable to a lightweight floor
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