DIY how to floor joists

      

 

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Timber Bearers and Joists

 

For Floor bearers & Joists work

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Bearers are the structural floor members that hold up the floor joists. Typically the bearer sits further apart from each other to hold up the joists. Typical timber sectional sizes for  hardwood bearers are HWD 100x75 & HWD Joists 100x50. Bearer spacings centre to centre are 1800mm and Joists 450mm centre to centre, or in to over, eg - from left side of the member to left side of the next member. For deep floor joists to span over longer distances, it is good practice to follow the AS timber framing code or timber span tables.

Some examples below for sectional sizes of F7 KD deep floor joists, using sheet flooring above.

 

140x45 span up to 2300mm (2.3 meters)

190x45 span up to 3300mm (3.3 meters)

240x45 span up to 4400mm (4.4 meters)

290x45 span up to 5200mm (5.2 meters)

 

For smaller sectional size joists to span longer distances, you can use LVL beams. Laminated Veneer Lumber. LVL's offer very straight lines and strong structures. LVL beams do cost a bit more than solid sectional size timbers, though they offer less middle support. for example you may require a room to be dug out from under your floor requiring peirs to be knocked out. head room could also be a factor. LVL's are the next best thing apposed to steel for supporting bearers or joists under a sub floor structure.

Post a comment or question about this article on floor joists

 

how_to_floor_joists: Graham
comment: What size LVL will I need to replace a 140x45f17 kdhwd floor joist @450mm max crs

Answer: Depending on the Span of the joist Graham Banksie! what is the Span?

 

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For Floor bearers & Joists work

Sydney Wide Carpenters

Phone or text 0417 223 923 Land line 96533105

Web www.swcarpenters.com.au

Email enquiries@swcarpenters.com.au

 

 

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