"I just finished a deep retrofit and used 2" polyisocyurate interiorly firectly over old rock, strapping, new rock.
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Sloan Ritchie
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Interior rigid insulation retrofit
6 Replies
On this retrofit project, the home has vaulted ceilings, so plenty of room to add insulation at the interior ceiling and re-finish. There's existing 7.5" (poorly) insulated ceiling joist bays with…Continue
Started this discussion. Last reply by Bradford E. White Jan 5, 2011.
Looking for a good detail for using 1" rigid on exterior
7 Replies
Anyone used 1" rigid in a new exterior wall assembly before? What are the pros & cons, which rigid product did you use, which weather membrane (some are integral to the foam too). Any…Continue
Started this discussion. Last reply by Al Heath Jan 5, 2011.
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Al Heath replied to Sloan Ritchie's discussion Looking for a good detail for using 1" rigid on exterior
Bradford E. White replied to Sloan Ritchie's discussion Interior rigid insulation retrofit"I probably should have been more clear, but yes, the new applied interior skin would have an appropriate class of vapor retarder. That said, if the edges are not sealed, even the insulation will not matter. Heat and moisture will go where it is not."
Ed Voytovich replied to Sloan Ritchie's discussion Interior rigid insulation retrofit"Nice project, Leo. If your Dow rep is as stellar as mine is, she can probably help you out in future with a piece of software they have that models your wall assembly and calculates where the dew point will fall at a given temperature."
Leo Klisch replied to Sloan Ritchie's discussion Looking for a good detail for using 1" rigid on exterior"Yes, the dew point is the issue but also has to do with cold air leakage through cracks around the foam panel joints and windows that ends up creating cold spots inside the wall for potential small spots of condensation inside the wall if inside…"
Leo Klisch replied to Sloan Ritchie's discussion Interior rigid insulation retrofit"In 2006 I general contracted a house that we now live in. I was going to foam on top of the 5/8 sheet rock (needed for fire code) that was installed on the vaulted and drop ceilings. Because of cost and schedule I decided to instead use 2"…"
Sloan Ritchie replied to Sloan Ritchie's discussion Looking for a good detail for using 1" rigid on exterior"I discovered this comprehensive answer to the design question here:
http://www.greenbuildingadvisor.com/blogs/dept/musings/calculating-minimum-thickness-rigid-foam-sheathing
thanks for all your suggestions!"
Ed Voytovich replied to Sloan Ritchie's discussion Looking for a good detail for using 1" rigid on exterior"In Central NY we use 2" of XPS to keep the dew point at heating design temperature (-2°F) outside the wall assembly. These homes are quite comfortable, get excellent blower numbers, and are well prepared to fend off the universal…"
Sean Lintow Sr replied to Sloan Ritchie's discussion Interior rigid insulation retrofit"I would lean more towards Ed's last solution with a caveat, I am assuming this roof is vented - if so I would trim down some XPS panels as firring strips 1.5" x 1.5" placed against the roof sheathing against the joist (2 in each bay -…"
Jim Peck replied to Sloan Ritchie's discussion Looking for a good detail for using 1" rigid on exterior"Interesting Conclusions in the "White Paper"."
Ed Voytovich replied to Sloan Ritchie's discussion Interior rigid insulation retrofit"If the insulation is on the inside in a heating climate it needs to be an effective boundary against vapor transmission to keep moisture away from a potential condensing surface. Especially if there is a tongue and groove ceiling finish. …"
Bradford E. White replied to Sloan Ritchie's discussion Interior rigid insulation retrofit"I have done both interior applied and exterior applied. Both of us will agree that exterior is superior, with inherently higher integrity. But reality dictates, so will not argue that point. When you say EPS, I presume you mean expanded polystyrene,…"
Sloan Ritchie joined Sean Lintow Sr's group
Best Practices (Residential)
Best Building, Retrofitting, or even Auditing Practices - what are they, what should change, what needs to find it's way to the dust bin of history?See More
Sloan Ritchie posted a discussionInterior rigid insulation retrofit
On this retrofit project, the home has vaulted ceilings, so plenty of room to add insulation at the interior ceiling and re-finish. There's existing 7.5" (poorly) insulated ceiling joist bays with 1/2" drywall finish, so one option is to simply add say 4" of EPS to the assembly, screw & glue to the drywall, and then finish that with perhaps cedar panels. Question is, is this a durable assembly, one that won't have moisture or other problems? Ideally we'd add it on top of the roof…See More
William Wesson replied to Sloan Ritchie's discussion Looking for a good detail for using 1" rigid on exterior"Possibly overkill, but the Building Science Corp white paper might help:
http://www.buildingscience.com/documents/reports/rr-1012-residential-exterior-wall-superinsulation-retrofit/view"
Scott cragun replied to Sloan Ritchie's discussion Looking for a good detail for using 1" rigid on exterior"I've used XPS rigid foam on both new construction and retro-fit applications, the amount of rigid foam ( R value) will depend on the climate zone you live in, colder climate zones require a higher percentage of the balance between exterior…"
Sloan Ritchie posted a discussionLooking for a good detail for using 1" rigid on exterior
Anyone used 1" rigid in a new exterior wall assembly before? What are the pros & cons, which rigid product did you use, which weather membrane (some are integral to the foam too). Any experiences good or bad are welcome.ThanksSee More
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