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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Carpentry Questions >> Chipboard floor https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1259016121 Message started by old diyer on Nov 23^rd, 2009, 10:42pm

Title: Chipboard floor
Post by old diyer on Nov 23^rd, 2009, 10:42pm

Help
I have to replace my bathroom floor
The house was built with the first floor completely covered with chipboard then divided into rooms with paramount board
When laying new chipboard can i butt it up to existing board or do i leave an expansion gap as you would when it meets a wall
If so how much of gap
any advice appreciated

Title: Re: Chipboard floor
Post by woodsmith on Nov 24^th, 2009, 4:55pm

If you have cut out the old chipboard you don't need to leave a gap between the new and old chipboard. Where you would need to leave a gap is if the floor butts up against an outside wall, then 5-10mm is enough.

Where the old and new boards butt up you will need to add some support underneath the joint, unless it happens to correspond with an existing joist.

There are different thicknesses of chipboard flooring, make sure you get the same as you have taken up.
Screw the new boards down rather than nail them, it will prevent any damage to the ceiling of the room below.
The long joints along the edge of the boards do not need to be supported the short joints do. They should be over a joist, otherwise fit some support underneath.
Glue the joints, it helps to stop creaking and stiffens the floor.

I think that is it. Hope it helps.

Title: Re: Chipboard floor
Post by old diyer on Nov 24^th, 2009, 10:23pm

Woodsmith Thanks very much for taking the trouble to answer my question
Its exactly what i wanted to know

Many thanks Mike

Title: Re: Chipboard floor
Post by big_all on Nov 25^th, 2009, 2:47am

if i can add to woods excelent answer
you need to be carefull if a wall is supported between parrallel joists and you cut along the wall line then you need to add noggins to connect the joists either side and support the wall

Title: Re: Chipboard floor
Post by old diyer on Nov 26^th, 2009, 9:33pm

thanks big all for the additional information.

I was going to use 4.5 60 passivated chipboard screws
Should i put a pilot hole through chipboard first or just screw straight through
Your recommendation on this please

Thanks mike

Title: Re: Chipboard floor
Post by big_all on Nov 27^th, 2009, 12:16am

chipboard screws should be just fine no pilot nessisery

just check you dont need a countersink but i very very much doubt it
and by check i mean screw home about 10 screws and providing they all go below the surface flush and no more than 1 breaks[head pops off ] then screw away ;D