Four Step Weatherization Guide | Check for signs of Water

The (Re)Weatherization Sequence :

Step 1: House Air Tightening and Systems Checkups

1. Duct sealing and insulation. If you have forced air ducts in your house, have them tested and sealed by a state certified duct-sealing contractor. Ducts should only be sealed with duct mastic, never with tape (Home Depot often carries duct mastic). While the duct sealers have their blower door set up, find out how leaky your house is, and where the leaks are. Consider installing additional return registers or pressure bypasses if you have a single return forced air duct system. After they are sealed, insulate the ducts to at least R11 (R25 is better), even if they already had an inch or two of insulation. If the system has air conditioning, put a vapor barrier on the outside of the duct insulation.
   
2. Air seal the house. Use caulking, spray foam, plywood, sheet metal, and weather-stripping, to seal places where air moves inside from outside, and also vertically through the house. Seal around windows and doors, seal the gaps around plumbing, wiring, mechanical, and chimney from underneath the house and from the attic. Sweep attic insulation aside, clean and foam the cracks where interior and exterior walls meet the ceiling. Cover the holes where plumbing drops through the floor under the bathtub and shower. Install outlet and switch cover plate gaskets. Remember that fiberglass does not stop airflow! A dense cellulose pack will reduce infiltration. Using a blower door makes airsealing faster and more effective.
   
   
   WARNING! Steps 1A and 1B. If you have any combustion appliances in your home, equipment that burns wood, pellets, gas, propane, oil, or kerosene, such as fireplace, woodstove, space heater, gas log, water heater, furnace, range or oven, etc., it is critical that you have a trained contractor perform a Worst Case Depressurization Test, or Combustion Appliance Zone Pressure Test to verify that the changes in the house have not created combustion gas backdrafting hazards. Combustion gas backdrafting can be fatal or cause long term health damage. An state certified duct sealing contractor can perform this test for you, and show you how to correct any hazards.
   
3. Ventilation and other systems checks. A blower door test will demonstrate how tight your house actually is, and where you may have missed a leak or two while airsealing. If your house tests below .35 air changes per hour (ACH), you should install fresh air vents as well as a high quality spot ventilation bathroom fan, or, ideally, an air-to-air heat exchanger to help maintain good indoor air quality. Install quiet bath fans and make sure they are properly vented outside through the roof or wall (see the Energy Outlet handout on bath fans). Install a range hood or verify that the existing fan vents to the outside in galvanized steel parts only. Make sure the dryer vent goes completely outside, in metal duct, not plastic. Now is the time to replace knob and tube wiring, add a grounding conductor, or otherwise upgrade your electrical system. Add phone or data lines. Check for adequate attic and crawlspace ventilation. Complete any structural repairs. Make sure water pipes are freeze-protected. Check for signs of water leakage around flashing at windows, doors, and dormers. Dry out that wet crawlspace with drains or a pump, and install a 6 mil plastic ground sheet.