Passive House BKLYN

Energy Revolution in a Brooklyn Townhome

Monthly Archives: February 2010

January Progress Report

Our plumbing inspection passed and we’re working on the final leg of our electrical and hvac roughing before the walls can be closed up. First we”ll perform another blower door test to see where we fair with our air leakage tests. We’ll likely have to do another run through with cans of foam and tubes of caulk. An air test will also be done on the ductwork to check for air leaks along the joints. these joints were covered heavily with mastic which is a sealing agent that paints on and dries to an air tight surface (if applied thoroughly). Old installation practices and tests have shown that as much of 30% of heating and cooling energy is lost behind walls and ceilings from unsealed duct joints. The air tests we do will point to any leakage and assure minimal loss of our conditioned air into interstitial spaces for maximum efficiency.

In the cellar the percolating lines will be set any day, a 3″ layer of gravel will follow before a 2″ layer of foam is sprayed. Details in the basement where the floor and walls meet are very important so a close eye on the how the different contractors perform their work is necessary. We have a mason, a carpenter and a spray foam installer working on this so the need for oversight is high. The extreme cold weather has also proven to be a challenge and will push back the sprayfoam installer if we don’t get a few milder day’s soon.

Our client has decided to go ahead and replace the roof on the addition. After demolition of the interior room there was some rot and water damage on the underside of the roof deck. There was no clear water leak but there was too much uncertainty in the roofs integrity to install interior finishes. This work will give client the peace of mind in knowing they have strong new roof joists, roof deck and membrane which will last for 20 plus years. The interior side of this roof deck will be sprayed with 8+ inches of foam with an R-60 protection from heat loss.