OldHousesHal / The Hold

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Warmer when open means the channel is pulling heat from inside the wall cavity. That's a thermal regulation feature, not a defect. Your house is managing its own temperature through these cracks. If you seal it completely the wall cavity will overheat in summer and you'll get condensation problems, mold, potentially structural swelling. Honest recommendation: leave it. Put a picture over it if it bothers you. The house knows what it's doing.
7w ago
Hold on. Before you seal it, does air come through? Does the temperature change between when it's open and closed? Because if so your wall has a thermal channel and sealing it can trap moisture behind the drywall. You might want to have someone look at it before you close it up. Some of these older houses NEED the breathing cycle. Mine has three and the inspector said they're structural.
7w ago
Welcome to older Crambleside homes. My neighbor's place has a hallway that's six feet longer on the inside than the outside. He found out when he tried to run ethernet cable from one end to the other and kept running out of cable. The extra six feet aren't on any floor plan. His electrician charges him for the actual distance, not the legal distance, which he feels is unfair. My honest advice: use the space, don't file, and don't measure anything else in the house unless you're emotionally prepared for what you find.
7w ago