I have an 1850 house upstate ny the ceiling right now is just lathe and plaster and the attic has no insulation.
Plaster repair material for air sealing attic.
The opening around a furnace or water heater flue is a major source of warm air into the attic photo 5.
A traditional multi coat plaster system begins with a substructure of lath thin wood slats or metal mesh that s attached to the wall framing.
Fill the attic with additional insulation.
Roll a piece of fiberglass batt and stuff it into place at the top of the wall where the top plate is missing.
Three coats of wet plaster are applied in layers to the lath.
If there s no wood staple it right to the drywall.
What most people don t realize is that all winter long they are heating the space behind.
To reduce air flow a homeowner will first need to air seal.
I ve heard that the plaster is actually porous enough that it needs to be sealed with plastic or something.
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Figure 5 the fiberglass roll is covered with spray foam to air seal the top of the wall.
Press the flashing metal into a bead of latex caulk and staple it into place.
Cover the roll of fiberglass batt with spray foam to air seal it in place.