David Mar

• David Mar - https://www.marstructuraldesign.com/
• Double stud between panels are too much. But necessary for expansion
• Leaves on flat roof
• Snow clogs on drainage
• Make roof bulletproof - not for only water
• Interest in dimensional control of foundations for SIP based ADU
• Overhangs are highly recommended. Get this on current version?
• Can build up a leaf condition on top of the roof.
• Difficult if just openings to drains.
• Labor skill is variable
• Metal roof is best -
• There is hardware that avoids birdsmouth
• Make the framing hard and waterproofing easy. Waterproofing as bulletproof as possible. Metal roof sounds great.
• There are PV panels that can clip right on to metal roof
• Solar panel frames that clip directly onto ridges of the roof.
• Single slope to the south. Clip them to metal.
• Minimum slope of metal roof - 3" per foot.
• 6'8" for occupiable space
• Short walls on third floor. 4 feet to 7 feet.
• Local work - best for structural engineer to work out bugs in realtime.
• Early-on design review - most good on the front end. Offer from David Mar.
• Ideally PDFs at end to mark up.
• Concept design - and feedback session.
• Build to last - not have someone rebuild in 10-15 years.
• PDFs that show panels and how they come together?
• Still need: footing plan. Insulation coming out a certain number of feet. Missing insulation coming out.
• 2x4 studs - OSB - Rigid - Finish.
• Cost of engineered joists? $80 compared to $35 for 2x12. At 16' go to engineered joists? Not yet the sweet spot of engineered joists.
• Throw in a block underneath double header. We have a 16" (walls) and 24" system (joists) wherever we don't have
• DIY SIPs? Passive house standards for cold climates? Superroof?
• Spider Crane - [1]. One company - [2]
• SIP Lines - make SIPs.
• Price point - $350/sf. Includes kitchen/bath/foundation - all-in cost. For ADUs in California.
• Baseline cost of foam for SIPs? David says it's not an issue.
• SIP roofs and stick walls?
• Plumbing outside of a structural wall.
• Interior finish are clip-on - that does a cavity.
• Summary - David and Craig can provide feedback on OBI/OSE design of the Seed Eco-Home