pitched slate roof, in attic, to be sealed with plasterboard including foil vapour barrier
2007-01-04 06:37:24 · 6 answers · asked by Anonymous in Home & Garden ➔ Do It Yourself (DIY)
Have you thought of hiring someone to blow in insulation in the attic. It works really good and won't take much time.
2007-01-04 07:48:18 · answer #1 · answered by schell_75 3 · 0⤊ 0⤋
The ISO foam would be the best but it is pricey. if you as someone has suggested jam in some fiberglass, or blow it full of celulose you will restrict airflow and trap moisture in the rafter cavity. it doesent take long and the wood begins to rot. the r value of the blown in or the fiberglass is drasticly reduced by the moisture as well. the foam products are usualy closed cell and water proof so it does not allow moisture migration. 4 by 8 sheets of foil faced isocyanurate foam will give you about an r 10 to the inch applied over the rafters and then the sheetrock over this should service very well. if you do opt for fiberglass make sure the soffit and the ridge are vented and that you do not entirely fill the area allowing for air to travel allong the underside of the roof.
2007-01-04 14:02:10 · answer #2 · answered by oreos40 4 · 1⤊ 0⤋
You dont.
Use kraft faced fiberglass batts. Jamb them between the studs, Staple the flanges to the studs to hold them in place. You could find some guys dirt cheap to do this. Or get a respirator and gloves and do it yourself.
Or you could pay someone a couple of grand to spray in expanding foam or some other expanso-polystyraphonicmumbojumbo for even more money.
You can get R-19 fiberglass batts at any home improvement store.
I am guessing you are converting your attic to living space and that is why you are insulating the rafter space?
If you are just worried about insulating walls in dead attic space, dont even bother. You definately dont want to create an oven up there. Just blow in some cellulose (or lay in batts) on your ceiling to keep the outside air out of your living space . You want your attic to breath. And check your ventilation up there. You need 1 sq. ft. ventilation for every 300 sq. ft. of attic (I think that's the right number)
2007-01-04 08:41:33 · answer #3 · answered by rheins2000 2 · 2⤊ 0⤋
Be sure that the material you use does not 'outgas' and leave toxic odors or breakdown into them....there are SOOO many good radiant barrier options - check into them before deciding exactly what to do...obviously - be sure you have enough foam thickness on the floor of the ceiling and often you can lay the radiant material on top. If you live in Texas like I do it is the heat in the summer that you worry most about...but check with local home outlet centers in your area to see what they recommend...and go to several before deciding.
I have used the foil paper barriers - the spray in barriers and the foil one sided styrofoam....I preferred none over the other...just depends on your roof - your roof pitch - etc.
GOOD LUCK!
2007-01-04 06:52:14 · answer #4 · answered by 100%cotton 2 · 0⤊ 0⤋
I have exact same attic and during the winter our flat is freezing cold, i'd advise you to get a reliable and reputable professional to look at it as attics tend to have loads of wiring and roof supports, do it once and for all.
2007-01-04 06:42:10 · answer #5 · answered by Onyimeme 2 · 0⤊ 0⤋
THAT NEW SPRAY STUFF - ICELYNE - BETTER THAN STYROFOAM!
2007-01-04 07:52:13 · answer #6 · answered by Bonno 6 · 0⤊ 0⤋