i thinking bout having some one cut the cores at my house elevator
As long as the house has adequate ventilation it is really really good stuffIt is water proof at two inches and air proof at one inchYou don't need anymore than 5 inches of spray foamLiterally 6 and 7 inches of spray foam don't perform any better than 5 according to studies contractors speak of in freezer testsSpray foam performs much better at 5 inches R-30 than batt insulation does at R-60This is because batts will cover only 95 to 98 of their intended space, and spray foam covers 100% due to how it is installedBlown-in insulation tends to perform better than batts in a level attic space since it tends have less accidental gaps Down sides, if you spray it to the underside of the roof deck, manufactures won't honor asphalt shingle warrantiesThe reason for this is if water gets trapped between shingles and the foam, and it freezes then your singles will die quicklyUsually if this happens then your shingles were installed wrong, because the moisture won't come from inside the houseWarranties demand 1 inch of ventilation to drain the deck of moisture Can cause the house to turn musty if you have inadequate ventilation for the houseYour roof will not breath, therefore moisture has to be collected another wayIf your house already had a plastic vapor barrier installed below the existing insulation, then you won't see a difference from the current setupIf the house was drafty, then there will be a big difference However cases where moisture condensates on the walls and windows are rareThat happens in houses that don't have venting and don't open windowsIf you have a moisture control problem a musty smell is the worst the average homeowner will experience.
As long as the house has adequate ventilation it is really really good stuffIt is water proof at two inches and air proof at one inchYou don't need anymore than 5 inches of spray foamLiterally 6 and 7 inches of spray foam don't perform any better than 5 according to studies contractors speak of in freezer testsSpray foam performs much better at 5 inches R-30 than batt insulation does at R-60This is because batts will cover only 95 to 98 of their intended space, and spray foam covers 100% due to how it is installedBlown-in insulation tends to perform better than batts in a level attic space since it tends have less accidental gaps Down sides, if you spray it to the underside of the roof deck, manufactures won't honor asphalt shingle warrantiesThe reason for this is if water gets trapped between shingles and the foam, and it freezes then your singles will die quicklyUsually if this happens then your shingles were installed wrong, because the moisture won't come from inside the houseWarranties demand 1 inch of ventilation to drain the deck of moisture Can cause the house to turn musty if you have inadequate ventilation for the houseYour roof will not breath, therefore moisture has to be collected another wayIf your house already had a plastic vapor barrier installed below the existing insulation, then you won't see a difference from the current setupIf the house was drafty, then there will be a big difference However cases where moisture condensates on the walls and windows are rareThat happens in houses that don't have venting and don't open windowsIf you have a moisture control problem a musty smell is the worst the average homeowner will experience.
Don't you watch Myth Busters? They busted this old mythYou can fly in an elevator, not without crushing all the bones in your body.
Don't you watch Myth Busters? They busted this old mythYou can fly in an elevator, not without crushing all the bones in your body.
