On a 1950's cape in Oreland Pa (zone 4 but near 5)we are retrofitting attic insulation and doing a new roof. Generally, the proposed roof section of this cape will be metal shingles, 1" foam, original roof deck, dense-packed 2x8 rafter bays. Given the foam-on-roofdeck, it is intended to dry to the interior. Questions:

1) Does anyone have experience with metal shingles? We are looking to avoid asphalt and make the most sustainable decision given the budget. What is the best underlayment? What other roofing materials should we consider? We want to use a shingle manufacturer that will accept a hot roof assembly in terms of their warrantee.

2) With the build up of foam/plywood on the roof deck and no overhangs, what is best way to finish the now-large roof edges? What considerations at the valleys? Best type of foam? How thick for the plywood? Note: This is currently an unvented roof with no opportunity to ventilate because of no overhangs and the presence of dormers and valleys prohibiting adequate and balanced ventilation.

3) Should we use CCSF inside the kneewall attic spaces at the eaves to properly seal and insulate the bottom of the slope and down across top plates?

4) If we dense pack the roof rafter cavities where it is sheetrocked (from the top, since we are re-roofing), what is the best way to deal with the open bays between the kneewalls and eaves? In other words, how do we dense pack the open bays? should we clad the underside with rigid foam and then dense pack? Again, this is intended to dry to the interior, so while CCSF would be easier, it would create the dreaded sandwich, as might the rigid foam panels on the inside.

5) The actual attic above the 2nd fl. ceiling is only 4' across and 3' high, it is a 10 pitch slope. Should we fill it with cellulose? There is only 1 insulated flex duct serving as a return jumper in the attic and no HVAC equipment. There are gable end vents that we will seal up. There will be no chimney.

6) There is a history of ice-dams at one section of lower roof. I am hoping that we can remedy this by this treatment. Any thoughts?

7) What considerations if any with the following roof penetrations: 2 bathroom ventilators,1 vent stack; 2 copper antifreeze lines for solar-thermal; 1 wood stove chimney- B vent.

Many Thanks!

Views: 161

Reply to This

Videos

  • Add Videos
  • View All

Latest Activity

Kevin Daly added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

Minneapolis Blower Door Model 3 for sale

Selling minimally used Minneapolis Blower Door DG-700 model 3. Includes model 3 fan, DG-700…See More
4 hours ago
Profile IconDamon Morales, Thermodyne Boilers, Michael Woodham and 1 more joined Home Energy Pros
12 hours ago
marius gherman posted a video

Winter conditions, perfect operation - ROTEX / DAIKIN heat pump

FIAMMA company, ROTEX partner in Romania, offering turnkey packages to improve energy efficiency, from supply to installation. With an experience of over 25 ...
12 hours ago
Profile IconJeffery Liang and Ellen Phillips Soroka joined Home Energy Pros
Friday
Charles Cormany added a discussion to the group Job Board
Thumbnail

Energy Efficiency Incentive Program Manager - Efficiency First California (Berkeley)

Position Title: Program Manager Terms: Full time, available immediatelyAbout Efficiency First…See More
Thursday
Charles Cormany joined Diane Chojnowski's group
Thumbnail

Job Board

This group is for posting jobs related to all aspects of the home performance industry including…See More
Thursday
Linda Wigington liked Home Energy Magazine's blog post Art Rosenfeld's Legacy
Thursday
terry nordbye added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

Combustion anaylizer Testo 310

This little beauty only has a few hours on it. Almost brand new in box.Sell: $350.Terry 415 669…See More
Thursday

Home Energy Pros

Welcome to Home Energy Pros – the unique digital community by and for those who work in the home energy performance arena.

Home Energy Pros was founded by the developers of Home Energy Saver Pro (supported by the U.S. Department of Energy) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network. Please honor our Guidelines

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service