Matter of Spec

Category Archives: Matter of Spec

Clarification on wall systems article

The April 2013 issue of The Construction Specifier included a technical feature by J.W. Mollohan, CSI, CCPR, CEP, LEED GA, entitled, “Exterior Wall Assemblies: Are You Getting What You Specified?”  We received the following letter from Cliff Black, a CSI member and a building envelope product manager for Firestone Building Products.

I am writing in regard to the article on exterior wall assemblies. I agree with the author the issue is certainly a challenging …

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Concern regarding long-term insulation data

The December 2013 issue of The Construction Specifier included the article, “Out of Sight, Not Out of Mind,by Ram Mayilvahanan. The feature focused on expanded polystyrene (EPS) and included reference to a particular industry study. In response to the piece, we recently received the following e-mail from John Ferraro, executive director of the Extruded Polystyrene Foam Association (XPSA):

This article included conclusions on the long-term thermal performance of XPS in below-grade applications contrary …

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Updating values for polyiso

The January issue of The Construction Specifier included the article, “Impact of Advancements in Model Energy Codes,” by Jared O. Blum. We received the following letter to the editor from Tim Merchant of the EPS Industry Alliance, an organization representing those in the expanded polystyrene community.

The EPS Industry Alliance has always supported informative articles that advance the knowledge, proper use, and application of foam insulation. That said, the article makes some inaccurate claims …

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Sounding Off on Acoustic Sealants

SoundTransmission

In the February issue of The Construction Specifier, we published the article, “Using Gypsum Wallboard for Acoustical Control,” by Ashwin L. Himat. The piece dealt with new drywall products designed to reduce noise. However, one reader was concerned there was a bigger picture to keep in mind. Steven Zalben, AIA, NCARB, LEED AP, wrote:

The use of acoustical sealant to reduce sound transmission was only cursorily mentioned. Using an appropriate sealant on both top …

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XPS, EPS, and Dock Flotation

After the feature, “Out of Sight, Not Out of Mind: Specifying Thermal Insulation Below-grade and Under-slab” ran in our December 2013 issue, we received a letter from retired architect, Joseph S. Bond. Mr. Bond wrote that the article in question “seems to reverse the findings” from both his personal and professional experience with expanded and extruded polystyrene (EPS and XPS):

I am a retired architect, and may not have the best current information on EPS …

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Re-examining Paver Performance

In the November 2013 issue of The Construction Specifier, we published the article, “Controlling Stormwater at the Source,” by Katie McKain, ASLA, MLA, MUD.  David R. Smith, CSI, of the Interlocking Concrete Pavement Institute (ICPI), wrote in about what he felt were some inaccuracies; we then shared his comments with the author.

I read with interest Ms. McKain’s article. She made some inaccurate statements about permeable interlocking concrete pavement (PICP) that require correction. This …

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