Recent Q&A

• Installed 3′ polyiso in my basement (Zone 5a) and humidity is now at 50%

  Hi all, So the background, we have a 1400sq ft basement , I have used XPS 3' to seal the rim joists with spray foam for the edges The rest…

• 把我带5attic into conditioned space

  So have been scouring for iso to do my basement walls and needed only 40 sheets, but Ive come across a guy who has 100 sheets and needs to get…

• Closed-cell foam in an unfinished basement in Climate Zone 4/5 (NYC) — 2″ foam — Is it enough?

  Just been given a quote for 2" CC in our 1480sq ft basement for $1000. I said I didnt want to put any batts etc inside when I frame the…

• Unfinished basement, Cgi 5 gas boiler, Z vent. The outside air is making the basement cold. Can it be louvered?

  Hi all, So Ive just finished sealing the rim joist with 2" XPS (Dow Blue board) and spray foam, sealed the perimeter between the walls and floor with silicone, installed…

• The old ‘keeping the room above the garage warm’ conundrum

  I have a 7 yr old 2 story colonial in Zone 4/5 (just outside of NYC) The room above the garage is cold, I opened a 1ft sq up and…

• Polyiso foam in basement: a rim joist question

  Hi all, Love this site, great hints Now Im in Rockland county a little north of NYC and have a 2007 2 story colonial I have added to the R38…

• Spiders still in basement 6 months after Ive airsealed and blockfoamed the joist bays

  Ok this has me scratching my head where these little[email protected]#%@ are coming from I block foamed and sealed each joist bay and sealed along the sill plate Any ideas…

• An open thank you letter for GBA’s help making my house more efficient

  To Martin and all at GBA, Im a home owner (built 2007) 2700 sq ft Colonial in Rockland County NY (Zone 5) Ive been following various discussions on reduction in…

• Airseal but still have a draft from basement

  Since I found you guys Ive airsealed my attic and ducts. I cheaped out our unfinished basement airseal/insulation with foam xps 1" foam sealed edges and r19 batt, the basement…

• Age-old question of insulation payback — only heating costs? Why not the costs of cooling?

  I'm in lower NY state Zone 5 (just), I have R-38 batts in the ceiling and want to put plywood down after bringing insulation level up 6 inches (cellulose). Now…