Glad you mentioned workmanship as a key element for a successful assembly. Our favourite strategy is a scissor truss with a continuous ventilation baffle, (usually MSL wood fibre because it is easy to work with, affordable and vapour open) that runs from soffit to ridge. At the interior a monolithic air/vapour membrane, Intello or Majrex with fibreglass dense pack (or loose fill depending on slope). throughout the truss cavities and a 2.5” deep service cavity. We find this to be an economical system that allows for any roofing material or ceiling finish to be used and avoids foam all together.

@ASIRIDesigns

Ай бұрын

That is an excellent strategy, I assume you try to get a scissor truss profile with a raised heel?

@SommerBros

28 күн бұрын

@@ASIRIDesigns yes, definitely a raised heel. Typically 12” minimum.

Love your videos. I’m glad you’re talking about emissions from spray foam, which could be manageable if we only knew what they were and for how long they might persist. Further, please, let me say that, while I feel very positively towards mineral wool, I apply the same standards to it and all other materials used in construction. Many products are fabricated using chemicals like formaldehyde, so we need to concern ourselves with the possibility of the off-gassing of those chemicals as well. If mineral wool is going to be placed not only in the exterior walls, but also in the interior walls for sound proofing, then covered over quickly with drywall, its release during construction could be slowed. We have to measure home interior air for pollutants to know these things. Covering the drywall could slow off-gassing, and lead to exposure of the building occupants. There have been instances of off-gassing from drywall too. We need to start measuring for the presence of pollutants in all of the materials that could harbor and release them, then we’d be equipped to take the necessary actions to keep people safe. There simply is no conscionable excuse for not conducting safety studies of this kind. The companies involved would be well advised to do it themselves, get out in front of this issue, and take whatever actions may be needed. Relevant scientific and professional societies should concern themselves with this subject as part of their ethical practice responsibility.

Intello plus rockwool is my personal strategy for my upcoming home build 👌 - not a fan of spray foam and poly isonis expensive - I'm in Zone 3 coastal SC

Great video!

As always Liked#19 N Subscribed!!! I am going to be designing and building in the state of Maine, a Passive Solar Double (Skillion or Clerestory) Shed Roof house low sloped (Contemporary Modern) with Exposed Wood Ceilings beams and trying to learn Chief Architect!!!