Suspended Wood Floor Construction
However the floor structure is supported by external and internal walls. A suspended timber floor is the chosen way for many builders and consumers because of the following facts.
Thursday 14th february 2019.
Suspended wood floor construction. 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. Here you can find drawings for our ul fire rated floor assemblies and ul fire rated ceiling assemblies. 69 chapter 4 floor construction woodframe floor systems and concrete slab on grade floors are discussed in this chapter.
Supports underneath the floor are permanent and include sleeper walls or timber props placed at regular intervals. How a suspended timber floor is constructed. Some newer homes have manufactured i beam shaped joists.
A floor s framework is made up mostly of wooden joists that run parallel to one another at regular intervals. The floor can be formed in various ways using timber joists precast concrete panels block and beam system or cast in situ with reinforced concrete. Rather the reader is referred to the aisi standard for cold formed steel framing prescriptive method for one and two family dwellings aisi 2001 for guidance.
Building codes and limits. At the turn of the 18th century when construction techniques moved from boarded floors installed directly on the ground to suspended timber floors over a ventilated chamber the innovation solved a significant problem. It is possible to create a suspended floor of any size using sleeper walls to bridge the span.
It is more cost effective in residential areas. Floor joists are typically 2 by 8s 2 by 10s or 2 by 12s. A best practice approach to insulating suspended timber floors.
A suspended floor is a ground floor with a void underneath the structure. If there s wall board covered ceiling suspended from the underside of that floor the dead load increases to about 10 pounds per square foot. Fintan from our technical team discusses the thermal loss issues associated with suspended timber floors and outlines a best practice approach to tackling them.
It gives easy installation of under floor ducted heating systems. Although cold formed steel framing for floor systems also is permitted by the irc it is not covered here. Our range of drawings can help pros plan projects more effectively by utilizing designs for a fire rated ceiling assembly.
There are three key things that need to be considered when constructing or renovating a timber floor. A typical suspended floor is shown below in fig 1 with the joists resting on sleeper walls at right angles. The span that can be achieved is determined by the size of the timber joist used.
Heavier flooring materials increase the dead load even more. Ceiling joists are usually 2 by 6s or sometimes 2 by 4s if it is an older home. A typical wood frame floor covered with carpet or vinyl flooring has a dead load of about 8 pounds per square foot.
It has simply the best construction way for sloping sites low lying areas or sites with bad climatically conditions.
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