Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I am currently insulating a new room in my house. I am planning to put up a drop ceiling. I have insulated between my roof trusses. Do I need anything else between my drop ceiling and attic space other than insulation. I thought of putting either drywall or plywood but not sure if I need it or not.

share|improve this question
3  
Drop Ceiling = massive air leak through all the seams. Having a sealed air envelope is a major step towards heating efficiency. Plasterboard with sealed joints will always be more efficient as it allows you to trap the heat and control air egress instead of chimneying it out through all the cracks. See if some sort of vapor barrier can be used over the ceiling tiles and tee bar under the insulation to cut down on the air flow. – Fiasco Labs Jan 26 '13 at 19:17
    
I would up vote the above as an answer. 40% or more of heat loss is via air leaks, and drop ceilings are far from air tight. Drywall taped and seamed well makes a good air barrier, and it is less expensive and more fire resistant than taped plywood. Once you've sealed all the leaks, blow in at least the EPA recommended amount of insulation over top. – mfarver Jun 14 at 1:52

If your in a cold weather area a layer of poly creates a vapor barrier, otherwise Drywall and plywood have no insulation value. Notes for the insulation between roof trusses:

4" cavity space: R-13 or R-15 batts, 6" cavity space: R-19 or R-21 batts, if it's a wide open attic, use an R-30 or R-38 batt.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.