Building Code Questions
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Trying to understand Code required insulation for condensation control
When 2021 IRC raised insulation levels it did not make a corresponding increase to the condensation control insulation levels. Consequently 2021 has lower ratios compared to 2018. Does that mean…
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Help finding temperature data
IRC2018 defines an insulation ratio for condensation control in unvented roofs. In note B of Table R806.5 it says, "Alternatively, sufficient insulation shall be installed directly above the structural roof…
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Structural aspects of a double-stud wall
I like Lstiburek’s ideal double-stud wall with the structural wall on the interior. Durability and resilience are important to me and I think this wall is good from that perspective.…
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Smart Glass Maker Opens New Plant
The manufacturer of a type of glass that can be electronically tinted has opened a new manufacturing plant in Minnesota.
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using 1/2″ maple veneer plywood glued on interior walls of home can that serve as vapour barrier requirements as well to satisfy NBC?
I want use 1/2" maple veneer plywood on interior of home. Panels will be glued to studs and have laquer finish. Can this also serve as vapour barrier requirement.
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Are vapor diffusion ports now required by code?
Situation: I am in climate zone 2A, building a house with an unvented, condition attic space (ZIP system wall and roof). Roof deck will have continuous exterior insulation placed on…
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Fastener Pattern and Requirements for HVHZ
Adding 2 layers of 1 inch poly iso to my roof, In Southwest Florida, was looking to find out what the fastener pattern would be for the second layer of…
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Zone 3-Finishing /Insulating an Unfinished Bonus Room
Hello , I am in the planning phases of insulating and finishing an upstairs (above-garage) bonus room (Zone 3- Gwinnett, GA) for an existing home and I am trying to…
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Vegetative Living Roof – Load Calculations for Flat Roof Joists
We are moving slowly on construction of our PGH. I am the general contractor. The exterior is nearly complete and we are planning to install standard 4" LiveRoof modules on…
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Vapor retarder for walls in climate zone 4
I have a building with wall types:1. wood frame w/ batt insulation within stud space, no ci, exterior finishes - vinyl lap siding/board and batten, stone on metal lath over…