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GBA Pro Help

  • Question & Answers

    Opinions on this Roof Insulation Plan

    Im planning to insulate my roof 1. layer wood sheating 6 inch T&G boards 2. layer  2 layers Polystyrene 3 inch foil faced boards glued seams with can foam 3.…

  • Question & Answers

    Improving on old flat roof in PA

    This is for a 100+ year old end-row house in PA. The house is small, 2 floor, 840 sf + basement. The roof is going to be replaced, and this…

  • Question & Answers

    How to integrate an air to water heat pump into an single air to air hrv/erv system in a multiplex

    I am in the process of designing a 6 unit multiplex in Madison WI climate zone 6.  Units are 3-1144 sqft 3 bedrooms, 3-924 sqft 2 bedrooms and 1-924 sqft…

  • Question & Answers

    Fiber Cement over 2″ Rockwool Comfortboard 80

    I'm finding a lot of older articles on this, but not recent ones since it's become common.  Is wood battens the current state of the art for installing lap siding…

  • Question & Answers

    Metal Roof Installation Over Asphalt Shingles

    Hello Pros, There was some hail damage to my 19-year-old asphalt-shingled roof last summer and I am considering a standing-seam metal roof, with the idea of thin-film solar panels affixed…

  • Question & Answers

    Tech shield application

    anyone see a problem with this combo?zone 2 Using tech shield as radient barrier ( facing down toward foil on polyiso ) under (.30 sri ) shingles, over 3/4" or…

  • Question & Answers

    Insulating Basement Walls

    I'm in Spokane, WA, which is Zone 5 for construction purposes. It is a split level house built in 1970. We're finishing our basement (adding a bathroom and finishing the…

  • Question & Answers

    Finding a Contractor for Green Building Renovations

    I just bought a 1900s brick row home in Harrisburg, Pa in historic district.  I need a contractor who can retrofit energy efficient systems but does so preserving as much…

  • Question & Answers

    Manual J for Mitsubishi Hyper Heat Ductless Minisplits

    I just finished doing a heat load Manual J on Cool Calc. This is for sizing a Mitsubishi hyper heat ductless system. Could anyone chime in if you think something…

  • Question & Answers

    Half cathedral ceiling venting with spray foam attic

    Hi experts,Hoping to get some advice. I live in Massachusetts (climate zone 5A). Before we moved in to our current home four years ago, we converted the formerly vented attic…