Hi all,
I'm doing a garage conversion. The external walls are solid brick (9" thick). My building control officer has pointed me towards a calculator to make sure I get the right PIR insulation thickness to hit a 0.3 U value rating. This came out as 50mm on the celotex calculator. This includes a "low emissivity 25mm cavity" with "timber 25 x 47mm counter battens at 600mm intervals". I also have pipework and a boiler on this external wall. I mentioned this to the Building Control Officer and he wanted me to protect the gas pipes with some sort of steel shielding. So I have a bunch of questions if people don't mind:
1. First one is on installation of the PIR insulation. I'm assuming it is basically saying that I should set out studding on the brickwork at 600mm intervals. I then fix the PIR insulation to this studwork, leaving a 25mm cavity behind it. I then butt together the PIR sheets, mechanically fix them, and I believe I then tape them?
2. How does the plasterboard then go on top of the PIR insulation? just mechanically fix them through the insulation to the same underlying battens? (I know you can get the PIR celotex sheets with plasterboard stuck on but they seem very expensive)
3. What sort of steel protection do I need to give the gas pipes? Can someone point me to a product please? These would be in the
4. The boiler / vent pipe is installed on the brickwork at the moment. I understand this is OK, but I'm trying to picture what people normally do in this circumstance. Build boxing around it and PIR insulate the boxing was one idea I had? I'd have a cupboard door on the front with PIR insulation on the back of the door. Sound alright, or other ideas?
Thanks
I'm doing a garage conversion. The external walls are solid brick (9" thick). My building control officer has pointed me towards a calculator to make sure I get the right PIR insulation thickness to hit a 0.3 U value rating. This came out as 50mm on the celotex calculator. This includes a "low emissivity 25mm cavity" with "timber 25 x 47mm counter battens at 600mm intervals". I also have pipework and a boiler on this external wall. I mentioned this to the Building Control Officer and he wanted me to protect the gas pipes with some sort of steel shielding. So I have a bunch of questions if people don't mind:
1. First one is on installation of the PIR insulation. I'm assuming it is basically saying that I should set out studding on the brickwork at 600mm intervals. I then fix the PIR insulation to this studwork, leaving a 25mm cavity behind it. I then butt together the PIR sheets, mechanically fix them, and I believe I then tape them?
2. How does the plasterboard then go on top of the PIR insulation? just mechanically fix them through the insulation to the same underlying battens? (I know you can get the PIR celotex sheets with plasterboard stuck on but they seem very expensive)
3. What sort of steel protection do I need to give the gas pipes? Can someone point me to a product please? These would be in the
4. The boiler / vent pipe is installed on the brickwork at the moment. I understand this is OK, but I'm trying to picture what people normally do in this circumstance. Build boxing around it and PIR insulate the boxing was one idea I had? I'd have a cupboard door on the front with PIR insulation on the back of the door. Sound alright, or other ideas?
Thanks