I’m affecting an upgrade on a historic house here in New Canaan and I am willing to wager the carpenters who mortised these chestnut beams in 1834 never imagined a part soy expanding foam insulation being sprayed on their work 175 years later. This is one of the coolest jobs I have overseen in a while. Check out this short gallery of photos from today’s effort.
This is a 2 lb. closed-cell insulation with an R value of 6 per inch. We are achieving R20 on these old exterior walls of true 4x material. The closed-cell spray foam was chosen for it’s structural quality on this project which is predominantly without sheathing. For 175 years this section of the house has never been insulated. The siding was nailed directly to the studs, some of which are still hand-hewn chestnut post and beam. The siding I removed had square-cut nails securing it.
The homeowner tells me his walls are actually warm on the inside of his house this evening. It’s October 21st, 2008 and it’s partly cloudy with a chance of sprinkles. Brisk with lows in the lower 40s. BTW: The spray-foam is watertight, so my liability stress factor has just gone way down. Glad this phase is a success.