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The 2016 FHB House is energy-smart, connected, healthy, and durable. It’s small and sensible. Most of all, it’s a valuable model home, meant to educate designers and builders who aspire to create high-performance houses that are exceptional in their quality, comfort, and style.

Rhode Island 2016

Tools & Materials

Installing MemBrain

MemBrain vapor variable sheets are installed to the ceiling joists to block air movement into the attic.

By Mike Guertin
Article Image
Membrain 2
Cameron uses a cap stapler to attach CertainTeed’s MemBrain to the ceiling joists of the FHB House project.

While a couple crews worked on the porch, garage and roof, the crew working with Mr. Haynes tackled one of the most important steps in the project — sealing the living space from the attic. The second floor ceiling has to be installed in an air-tight fashion. On this project we’re using Certainteed’s Membrain ‘smart’ vapor retarder to block air from moving between the living space and the attic. To look at it you’d think it was ordinary polyetheylene plastic but Membrain has variable permeability to permit moisture vapor to move through while blocking air movement.

Cameron, Matt and Derek used cap staplers to tack the sheet to the ceiling joists. Cap staples are better than using hammer-tacker staples when you’re trying to minimize holes. The caps help protect the sheet from being damaged by the nose of the stapler.   And the caps prevent the Membrain from tearing out at the staple legs and crowns.

Membrain 3
Matt and Derek install 1×3 furring to the ceiling.

After the sheet was tacked up, the crew nailed 1×3 furring strips over the Membrain. The furring strips serve a couple functions: they hold the Membrain in place, they protect the material from damage when the interior partition walls are erected, and they create a space where some wires can be run without penetrating the Membrain.

The Membrain still needs to be tightly sealed to the exterior wall plates and to a strip of Membrain that Bruce and I positioned over the center bearing wall before placing the ceiling joists. The crew used TiteBond’s WeatherMaster Ultimate MP sealant. It’s super-sticky and bonds well to wood and plastics.

After the windows and doors are installed, we’ll use a blower door and smoke to find any leaks in the Membrain and seal them with tape or more WeatherMaster.

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Rhode Island 2016 Videos Behind the Build: Vermont 2017 Behind the Build: California 2018 Behind the Build: Kentucky 2019 Behind the Build: Connecticut 2020

Navigate the Build

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View Comments

  1. cbehr81 | Oct 20, 2016 01:11am | #1

    Smart membranes allow moisture to come back into the space from the enclosed stud / joist side of the vapor retarder. Great product for today's continuously insulated with foam walls and cathedral ceilings, but not necessary for properly ventilated attic spaces where the warm moist air should ideally be vented out of the attic. For attics go with standard poly sheet to control vapor entering the attic and save the good stuff for where it counts.

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