Heat Escapes Through Gaps Before It Escapes Through Fluff
Attic spray foam works because it seals the openings that let house air into the attic. An older home in Elmira or Floradale loses heat around pot lights, bath fans, the plumbing vent, the chimney and the tops of interior walls.
Dumping more loose fill on top leaves the air path open. Foam plugs each hole. With the leaks closed, the house holds its heat and the attic keeps its winter chill, which is what you want up there.
Ice Dams Start In A Warm Attic
Attic spray foam helps prevent ice dams on farmhouse roofs. Roughly 160 cm of snow lands on Woolwich roofs over a typical season. House air leaking into the attic heats the roof boards and thaws that blanket from underneath.
The melt runs down to the cold overhang and freezes into a ridge of ice. More melt then backs up behind the ridge and under the shingles. Sealing the attic floor with attic spray foam stops the warm air before it gets there.
Roof Deck Or Attic Floor
Attic spray foam can be sprayed up against the roof boards or down across the attic floor. Foaming the roof boards pulls the attic into the heated envelope. That suits a finished room upstairs, a low-slope roof or an attic with ductwork in it.
Sealing the floor keeps the attic cold. Often we spray a thin air seal across the floor and cover it with blown cellulose to save money. Your quote explains both choices.
Attic Spray Foam In Old Farmhouses
Attic spray foam in an old farmhouse often means working around knob-and-tube wiring, brick chimneys or plank roof boards. We check for these first and tell you if an electrician is needed before any foam goes in. Upstairs rooms tucked under the roof often have sloped ceilings, and our closed cell spray foam page explains why closed cell suits those narrow bays.
Bath Fans And Pot Lights Need Attention First
Attic spray foam goes around everything that pokes through the ceiling, so we check those things before we spray. A bath fan should vent outdoors through a sealed duct rather than dumping damp air into the attic. Older pot lights that run hot need a cover box or a swap to a sealed type rated for contact with insulation.
We point out each of these at the visit. Some are quick fixes we handle as part of the job, and some need an electrician or a roofer. Sorting them out first means the attic spray foam seals a ceiling that is ready for it.