Recent Q&A

• Toilet overflow caused water to enter the ceiling cavity: How to remediate?

  Hi all, An issue every homeowner faces now and then I'm sure, but I'm considering dealing with it differently this time. A toilet in a second-floor bathroom in my home…

• Better to compress attic blow-in fiberglass, or remove it?

  I’m going to be laying a subfloor in my attic, where fiberglass has previously been blown in between the joists. The blow-in insulation is currently thicker (deeper) than the joists, and…

• Insulating a *vented* cathedral ceiling

  Hi all, I'm in a bit of a unique spot, and having read (and re-read, and re-read again!) Martin's article, "How to Build an Insulated Cathedral Ceiling," I have a…

• Possible to spray foam onto (under) rafter vent baffles to maintain a ventilated roof?

  Hi all, With my current building project (detailed in this thread here), it came to light that the wrong kind of roof underlayment was installed (synthetic instead of asphalt felt),…

• How best to insulate a 12″ rafter-framed cathedral ceiling?

  Hi all, After reading (thoroughly, several times!) Martin's article, "How to Build an Insulated Cathedral Ceiling," I still have a number of questions. First, my situation:

• Foam over wall sheathing: Typar under foam?

  Hi all, We are doing 2 inches of rigid foam on top of (i.e., outside of) our wall sheathing (with fiberglass in between the studs). The lumberyard specified Typar between…

• How Important is Insulating Floor Between (Heated) Garage and Living Space?

  你好,我是构建ing a structure (described in depth in this thread) that includes an insulated, heated garage on the first floor and a living space on the second floor.…

• Venting a Roof With Exterior Rigid Foam

  你好,我是构建ing a garage in central Maine (Climate Zone 6) with an apartment above the garage (I'm going to insulate the entire building so the garage can be…