Q: We have a cottage built in 1935, and we want to insulate the walls and possibly the floor. Some contractors say I have to remove the siding, install fiberglass batts, then replace the siding with new material. Another said I could drill holes in the siding and put in foam insulation. Another wants to use treated shredded newspaper. I would be most grateful for your opinion. --Lucy D. A: If the siding is in generally good condition, having retrofit insulation blown into the walls is your most cost-effective option. On the downside, blowing in insulation requires that a series of holes be drilled in the siding -- one at the top of each stud cavity. These holes then need to filled and painted or otherwise covered, and I have seen some installations where poor workmanship le...
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