I have a question about a cold attic on a single-story building. The roof trusses are spaced 1200mm center-to-center, but to fit the insulation (if buying rolls), shouldn't you place intermediate joists between the trusses to get a 600mm center-to-center spacing that fits 555mm insulation? Or have I missed something? For simplicity, should the intermediate joists be made like the bottom frame of the truss?
Then I wonder how you handle windproofing laterally, should the asfaboard continue up between the trusses/joists so it can serve as a wind barrier?
/Anders
Then I wonder how you handle windproofing laterally, should the asfaboard continue up between the trusses/joists so it can serve as a wind barrier?
/Anders
This is not a roll but is called floor insulation and is suitable both between rafters c/c 1200 and on top of the subframe at the same c/c measurement http://www.isover.se/produkter/produktvisning?id=20774
What do you mean by the sealing, are you thinking about the gables? If so, you pull up the paper/gypsum/asfaboard or whatever you have as wind protection a bit above about 150 mm or more so that it does not blow into the insulation.
What do you mean by the sealing, are you thinking about the gables? If so, you pull up the paper/gypsum/asfaboard or whatever you have as wind protection a bit above about 150 mm or more so that it does not blow into the insulation.
Perfect product for my needs, thanks for the tip!
No, I meant the sealing along the long sides. The truss's toe sticks out maybe 500 mm from the outer wall and the truss is perhaps 250-300 mm high at this point. The panel is placed up to the underside of the trusses. The space above the outer panel but below the board is then uncovered, allowing air to blow freely. You can attach vertical strips and board as wind protection, but I thought asfan might just as well continue up, but if there's no intermediate beam to attach it to, it might become wobbly?
/Anders
No, I meant the sealing along the long sides. The truss's toe sticks out maybe 500 mm from the outer wall and the truss is perhaps 250-300 mm high at this point. The panel is placed up to the underside of the trusses. The space above the outer panel but below the board is then uncovered, allowing air to blow freely. You can attach vertical strips and board as wind protection, but I thought asfan might just as well continue up, but if there's no intermediate beam to attach it to, it might become wobbly?
/Anders
Sure, you can let the asfaboard go up against the ceiling, but you shouldn't seal it completely up to the ceiling; there should be an air gap. You can check out a construction example here http://www.isover.se/konstruktioner/konstruktionsdetaljer/k-c3-218+ytterv%c3%a4gg+-+takstol
Yes, that's what I thought, thanks for the info and examples!
/Anders
/Anders