Every part of the void under a timber suspended ground floor should be thoroughly ventilated through openings on at least two opposite sides Where this is not possible, effective cross ventilation from opposite sides should be provided by a combination of openings and air ductsTo identify a suspended timber floor, look outside for ventilation grilles just above ground level If there are not any vents outside it may be a solid floor See our fact sheet Radon sumps; One of the things you should see around the outside of a house which has suspended timber floors are subfloor airbricks They are, or should be, fairly regularly spaced and their purpose is to allow air ventilation within the subfloor void This air ventilation is very important, as it helps to keep the area within the void relatively dry

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Suspended timber floor ventilation- The area under a suspended floor, called a subfloor void is the space beneath a ground floor, suspended timber floor The actual size of this void – or space – can vary significantly from virtually nothing, where floor joists are in contact the substrate beneath, to something which you could crawl under The norm for this sort of space is Materials For Suspended Timber Floor Insulation There are three main options Celotex / Kingspan type PIR thermal insulation board This comes in various thickness (50mm and 100mm are the most common) and in a variety of sizes (24 x 12m being the most common)



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Proper ventilation in suspended timber floors is equally important, in terms of keeping the installed vents and air bricks effective or adding some ventilation if needed Also, be smart when installing wood floor insulation by taking some preventive measures that will allow you to inspect, upgrade and maintain your floors easier in the future Older properties (like sections of mine) with a suspended timber floor would ensure cross ventilation via air bricks to keep things dry Also important if there are any dwarf walls supporting say floor joists mid span, that this has a dpc somewhere to protect any timber sitting on it from getting dampDiscussion in 'Building' started by AL_1234, AL_1234 Joined Suspended floor/timber frame garden room 23vc, , in forum Building Replies 3 Views 307 noseall
This stops any build up of condensation and is assisted by building in airbricks through the external walls More can be seen about air bricks and underfloor ventilation in this project here A suspended timber floor on sleeper walls – Image courtesy of retrofitprojectcoukA damp proof course (DPC) should be placed between the timber and the wall Insulation is then placed between the joists (thickness depends on the product used) Air vents should be placed underneath to provide ventilation to the void and the air should be able to travel from one side of the building to the otherInsulating 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 insulation The climates requiring insulation to the underside
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 partsDetail for insulation of a suspended timber floor, where the existing floor void is not accessible from below, and it is not possible to lift the whole floor to insulate from above This solution proposes a aggregate insulation infill laid over the subfloor, with a controlled air inlet for ventilationBest 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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The new #800 MultiFlex Dance Floor is the ideal solution for those who want a suspended floor with a vinyl surface The floor installs quickly and easily The 5 7/16" inch wide tongue and groove boards come with specially designed Evazote 50 foam strips already attached to the bottom Simply glue the boards to each other and the subfloor isThis 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 Contaminants6 Air from the outside can and should flow under suspended timber floors, and this would typically be through air bricks or grilles in the outer walls Free flowing air can help to maintain a




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The Building Regulations Approved Document C states suspended timber floors and suspended concrete floors (including block and beam) have a provision for ventilation on two opposing external walls of not less than 1500mm² per metre run of external wall or 500mm² per metre² of floor area, whichever works out to give the greater amount of ventilationAround 12 million New Zealand houses have suspended timber ground floors Common subfloor problems include dampness, rot, poor ventilation and structural issues BRANZ house condition surveys have consistently found that damp subfloors are one of the most common problems in New Zealand houses with suspended timber floorsSub Floor Ventilation and cross flow ventilation for suspended timber floors is essential Many homes in Adelaide are built with a suspended timber floor and therefore have a large space under this area This subfloor space under your home is important to




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Became the timber floor structure positioned over compacted earth with an airspace in between This void underneath the suspended floor was ventilated via airbricks or other types of vent in the external walls to ensure a very effective air flow through the underfloor area 11 Ground floor structure The suspended floors found in most suspended timber floors located above an unheated space, where the insulation is installed below the floorboards or timber decking; Another thing that some people fail to realise is that the suspended timber floor void is also partly controlled by the internal environment, if you have a high vapour pressure in the building because of poor mechanical ventilation this will go to lower vapour pressure, like the roof void and also the sub floor void The majority of suspended




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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 the timber joists I've been scratching my head, trying to work out how to ventilate a timber floor that only has one external wall A room and hall way are having a suspended timber floor reinstatedThe recommended minimum area of ventilation required for under a suspended timber floor is 1500mm 2 for every metre of perimeter of the structure Cross flow ventilation was traditionally achieved by placing sleeper walls (see figure 2) at intervals throughout the subfloor The sleeper walls would be honeycombed in nature to facilitate airflow




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