Spraying Insulation To The Underside Of A Roof

When it comes to spray foam insulation that is applied to the underside of the roof between the rafters the financial benefits are even more impressive with the initial outlay recouped within just a few years on average.

Spraying insulation to the underside of a roof.

You can spray foam anywhere you d like to separate the inside from the outside. Convenience polyurethane or polystyrene spray foams can provide thorough coverage to roof rafters and attic walls in much less time than is needed for other materials. The spray on foam is a rigid foam that is lightweight normally sprayed on to the underside of the roof approximately 50 to 100 mm thickness. As well as a number of diy sites.

So what is the spray foam. I would like to avoid installing sheathing if possible extra waste but i don t want to compromise the r value of the spray foam or to have the foam ooze out between the metal panels as it expands. Yes you can spray foam the underside of your roof. Uneven or sloppy application however can make the insulation ineffective and unsealed open cell insulation can absorb moisture causing the roof to rot or leak.

But spray foam insulation used at the underside of the roof deck would need to be covered by a thermal barrier and intumescent coatings are commonly used. The movement of air into indirect conditioning of an unvented attic is a slow gradual process that will not be noticeable by occupants and typically will not put any strain on the hvac system. However i do have a concern about spraying foam directly on the underside of the roof sheathing and rafters. Spray foam insulation is versatile and can be used to insulate your roof loft walls and floor.

Closed cell insulation will not allow water to pass through it. Can you spray foam the underside of your roof. The 3 foot roof panels will be anchored to purlins that run diagonal to the rafters.