What is Timber framed subfloors ?

Subfloor consists of Bearers and floor joists. Timber subfloor must comply to timber framing manual which is part of Australian standards AS.1684 Subfloor members, Bearers and floor joists are structural members they transfer dead and live loads of the building to the foundation through stumps, piers, and footings. Size of bearers and floor joists and timber specie (type of timber) are determined by Australian Standards taking in consideration the applied loads on the bearers and floor joists, timber availability and suggests the span and spacing for the timber used.

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We at Advanced Construction Works, Restumping, Re-blocking and underpinning change rotten subfloor timber and construct subfloor for new homes, extensions, granny flats, decking’s. 

Most of timber yards don’t stock F8 Hard wood these days, it is very hard to get it, we use F17 KDHW or LVL instead.  

For Properties build 0ver 75-80 years ago, sometimes we come across subfloor system that is not used now and span and spacing of bearers and joists are under designed according to Australia Standards now. 

Subfloor ventilation is very important to reduce humidity under the subfloor which helps maintaining and preventing moulding, termite, and root. 

Number of stumps required can be reduced by using larger timber sections and better timber in terms of density that has better stiffness or resistants to deflection. 

Vast majority of properties build before 1990’s F8 Hard wood was used for their subfloor,100X75mm was used for bearers and 100X50 was used for floor joists. Bearers span 1200mm for load bearing walls and 1800mm for floors and the floor joists span is up to 1800mm. 

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Why Timber framed subfloors is important ?

We at Advanced Construction works can help you to improve your subfloor ventilation if it is not effective and efficient.  To have a clean crawl space is very important which helps air circulation under the house which reduces moulding and termite.