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Old 04-12-2010, 06:50 PM   #1
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T&G ceiling project w/radiant barrier?


I'm ready to put 1x6 T&G cypress planks along my vaulted (15deg) ceiling across the 24"oc trusses.

I'm going to remove the old drywall first and planned to add a radiant barrier (RB) across the bottom side of the trusses before nailing up the planks.

I'll raise/staple the RB up an inch between the trusses for an air gap.

Above the RB will be batt w/kraft face and blow in over that (= r60 DOE).

should i use perforated RB?
and does a 18g 2.5" brad gun deliver enough holding power?
i could pull the kraft off the batt and put up a nonperf RB vapor barrier?
or, what must i consider to best insure against mold?
(the attic has soffits and a ridge vent and gable vents)

thanks, folks
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Old 04-13-2010, 06:38 PM   #2
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I don’t know about your RB but I’ve done plenty of T&G vaulted ceilings and never done that. Different climates I’m sure require different applications but don’t need it in my neck of the woods. Ventilation is the important thing, you sure don’t want condensation issues.

I always staple my T&G, two brads with a bridge is better than one piece of wire any day.
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Old 04-13-2010, 07:54 PM   #3
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you have been reminded to include your location in your profile. We cannot give a good answer without knowing where you are located. But... you need a perfect airseal to the sealing. That is why the drywall was there. Although you need poly to do it right. Do not used kraft faced insulation at all in this location. You do need air space above the insulation. Normally this gets closed off more than you think. Recommendations are to make this space 2" I would use at least 1" space by making a form with 1" XPS cutting it to fit and folding over two partially cut ends to act as the spacer
Avoid any recessed lights in this ceiling.
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Old 04-13-2010, 09:06 PM   #4
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removing the drywall might be a code violation. some places like it behind ceilings as a fire protection.
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