Weatherstripping near you

DOE's Guide to Air Sealing makes a point homeowners rarely believe until a blower door proves it: air leaks around windows and doors are the most obvious, but there are often many smaller and less detectable ones, and other places to find leaks are where rising warm air is replaced by cooler air, as between an attic and the conditioned spaces below, or where exposed insulation shows dirty spots from air moving through it. The guide identifies at least 19 key areas where air sealing improves a home's efficiency, comfort and durability.

The practical consequence is a priority order. An attic hatch with no gasket, an uninsulated set of pull-down attic stairs, a row of recessed lights, a chase where plumbing runs up through a wall, and the sill plate where the frame meets the foundation are usually leaking more than the drafty-feeling window in the living room. A draft you can feel at ankle height in a room is often air entering somewhere you cannot see, and weatherstripping the door you can feel it at will not fix it.

This is the detail that separates a careful contractor from a casual one. The definition of renovation at 40 CFR 745.83 includes weatherization projects, giving as examples cutting holes in painted surfaces to install blown-in insulation or to gain access to attics, and planing thresholds to install weather-stripping. In a home built before 1978, planing a threshold is therefore not automatically outside EPA's Renovation, Repair and Painting rule.

What keeps most weatherstripping jobs out of scope is the minor repair and maintenance carve-out in the same definition: activities disrupting 6 square feet or less of painted surface per room for interior work or 20 square feet or less for exterior work, with none of the prohibited practices used and no window replacement or demolition of painted surface areas. Fitting a sweep and a jamb seal will usually stay well inside it. Planing several painted thresholds, scraping sashes so they close again, or graduating from sealing a window to replacing it will not, and EPA counts work in the same room within the same 30 days as one job.

DOE's Guide to Air Sealing is explicit on this point, and it is the one part of the job a homeowner should not improvise. Before air sealing, it says, it is essential first to determine how much fresh air is needed to ensure healthy indoor air quality and to properly ventilate combustion appliances such as stoves, ovens, fuel-burning furnaces and fireplaces. Without proper ventilation, excessive water vapor and harmful combustible gases can accumulate in the home, and if combustion appliances do not get enough oxygen they will operate inefficiently and may release dangerous gases such as carbon monoxide into the home.

Weatherstripping a few doors will not by itself starve an appliance. But when it is part of a broader tightening campaign, particularly in a house with an atmospherically vented furnace or water heater, DOE's recommendation is to involve a professional home energy auditor or a certified heating and cooling contractor rather than to seal first and find out later.

Fall is the obvious season and not always the best one. Adhesive-backed seals need surfaces that are clean, dry and warm enough for the adhesive to grab, so starting during a cold snap sets the job up to peel. Late summer and early fall give warm, dry frames and let the bond establish itself before the first hard freeze tests it, which is also when a drafty door is still merely annoying rather than urgent.

The other seasonal reality is that a door's fit changes through the year. A wooden entry door that closes tightly in February may be a little proud in August, so a seal fitted at one extreme can bind or gape at the other. A tradesperson who checks the reveal around the whole door before choosing the thickness of the seal is accounting for that, and it is the difference between a door that latches easily all year and one that has to be shouldered shut every summer.

The diagnosis comes first. DOE suggests a simple homeowner test: on a windy day, carefully hold a lit incense stick or a smoke pen next to windows, doors, electrical boxes, plumbing fixtures, outlets, ceiling fixtures and attic hatches, and where the smoke stream travels horizontally you have found a leak. A professional will usually also check that a door is still closing against its stop across its full height, since a door that has dropped will never seal no matter what is fitted to it.

Then the work: old seals removed rather than layered over, surfaces cleaned, hinges and strike plates adjusted where the door has moved, the new seal fitted with the door closed against it so the compression is correct, and the sweep set to touch the threshold without dragging. DOE's list of related interior work usually comes along for the ride, including foam gaskets behind outlet and switch plates and foam sealant at window trim and baseboards.

Opening count is the base, and condition is the multiplier. A door that closes squarely and just needs a sweep and jamb seal is quick. A door that has dropped, a threshold that has to be adjusted, a storm door that also needs sealing, or a set of original double-hung sashes that have been painted shut are all larger jobs than they look. Attic hatches, pull-down stair insulation boxes and sealing at the sill plate are usually priced separately because they are a different kind of work in a different part of the house.

If you post the job on LokalMatch, listing the number of exterior doors and windows, the approximate age of the house and whether anything has been painted shut gets you quotes that will not change on arrival. Homeowners post free; pros pay for the leads they choose to take. LokalMatch does not do the work or vet the companies, so confirm credentials and insurance directly.