Building a garden room not a swiss watch.isnt there going to be irregularities in the roof now were those upside down joist hangers sit. surely the osb wont sit flat due to the metal and nails standing proud of the joists.
Building a garden room not a swiss watch.isnt there going to be irregularities in the roof now were those upside down joist hangers sit. surely the osb wont sit flat due to the metal and nails standing proud of the joists.
It'll be about 1mm. There's 37.5mm of fall per m so should be fine. Flat rubber roofs can hold /pond water anyways.isnt there going to be irregularities in the roof now were those upside down joist hangers sit. surely the osb wont sit flat due to the metal and nails standing proud of the joists.
I redid the heal and toe on one of my bifold today and got some more noggins in! Sick of PIR now lol. I need to swap my 13cm coach bolts for 10.
I put the doors as far forward as I could as the cladding etc will easily eat them up. No precise maths.
All bracing can come off now, it's basically done once the roof and walls are osb'ed.
5" by 2". If you double them up it increases the carrying capacity by circa 15% apparently. They try keep the sizes low so that the height is where it is you want it (ie internally)How come you've doubled up all the roof beams? What size are they?
I feel that. It's such horrible stuff to cut. Just ordered another 3 sheets of 100mm to insulate the roof.Sick of PIR now lol.
I feel that. It's such horrible stuff to cut. Just ordered another 3 sheets of 100mm to insulate the roof.
I've just been using a normal hand saw to cut them and the amount of 'snow' it makes is unreal and awful to have blowing about the garden. Kind of need a long thin knife to do the job instead.
Been saving an old one for exactly this purpose!Bread knife
Excellent shout. Might have to buy a cheapo one next time I’m in Sainsbury’s.Bread knife
If the roof is at 400 gap then tbh the rounding error during cutting generally gives you a nice halfway house. I did my entire roof today pretty painlessly - only 2 or 3 out of 30+ that gave me a headache. Cutting a 2.4m sheet into 400mm blocks means you always end up some tight/some lose, but generally you get away with it every time.Excellent shout. Might have to buy a cheapo one next time I’m in Sainsbury’s.
Next conundrum is solving that fine line between cutting the PIR sections slightly too small so they don’t hold between the ceiling joists, and slightly too large that I have to wallop them in with a woodblock and mallet!
You’re obviously more accurate with a saw/breadknife than meIf the roof is at 400 gap then tbh the rounding error during cutting generally gives you a nice halfway house. I did my entire roof today pretty painlessly - only 2 or 3 out of 30+ that gave me a headache. Cutting a 2.4m sheet into 400mm blocks means you always end up some tight/some lose, but generally you get away with it every time.
Panel saw - it's quite hard to go wrong if you use the full length of the blade. You can always make a jig out of some CLS tooYou’re obviously more accurate with a saw/breadknife than me![]()