Comparing Polyiso and Expanded Polystyrene (EPS) from the past to today
We are pleased to announce Foam-Control EPS Technical Bulletin Roofing No. 3017 is now available. The bulletin compares the performance of polyiso and EPS from the past to today.
A school building located in Minnesota was recently undergoing a roofing system replacement and it provided the perfect opportunity to evaluate the performance of the existing roof insulations. The school was originally built in 1999 and consisted of a combination of polyiso and EPS roof insulation. Samples of both products were removed from the roof and evaluated for R-value at various temperatures.
Testing demonstrated the vastly different temperature dependence between polyiso and EPS. A plot of the R-value for the 17 year old polyiso and new polyiso demonstrates the dramatic change in polyiso insulation in recent years. “New” polyiso loses significant R-value at cold temperatures.
In comparison, the R-value for 17 year old EPS and new EPS are similar. This demonstrates that EPS can be trusted to have stable R-value performance.
It is very important to understand that the latest generation of polyiso insulations and EPS have very similar R-values when used at cold temperatures. This has dramatic implications when selecting your insulation product and its thickness for use in cold weather and cold storage applications
We are pleased to announce the release of an updated ICC-ES ESR-1006 Foam-Control Code Report. Foam-Control EPS products continue to maintain the highest levels of recognition in in the insulation industry, with evaluation reports available from both ICC-ES and UL.
ASTM D6817 and ASTM C578 Summary Table
We are pleased to announce a new ASTM D6817 and ASTM C578 Summary Table is now available to demonstrate the primary differences between Foam-Control Geofoam and Foam-Control EPS products.
The key differences between Foam-Control Geofoam and Foam-Control EPS insulation products are:
- Foam-Control Geofoam has requirements for compressive resistance at 1% deformation
- Foam-Control EPS insulation has requirements for compressive resistance at 10% deformation
- Foam-Control EPS insulation has published R-values
We hope you find the new summary table useful to understand the differences between Foam-Control Geofoam and Foam-Control EPS insulations.
The National Roofing Contractors Association (NRCA) has a new article, “Another Round”, published in the February issue of Professional Roofing that provides insight into the performance of Polyiso roof insulations. The article describes the test results from a recent round of testing on Polyiso by NRCA.
NRCA identified that Polyiso has ongoing problems with compliance to the requirements of the Polyiso standard, ASTM C1289 and NRCA has serious concerns over the dimensional tolerances and trueness/flatness of Polyiso.
Most importantly, NRCA “maintains its longstanding recommendation to roof system designers for use of a suitable cover board over faced, rigid board polyisocyanurate insulation”.
We are pleased to announce the availability of two new Foam-Control EPS Technical Bulletins covering the attachment of wall cladding/furring over Foam-Control EPS in accordance with the International Building Code and International Residential Building Code.
The use of continuous insulation is growing and understanding these Foam-Control Technical Bulletins helps to demonstrate attachment methods are available and accepted by the building codes.
We are pleased to announce the availability of an updated Foam-Control Roofing Technical Bulletin No. 3001.
The National Roof Contractors Association (NRCA) has published a new recommendation for the R-value of polyisocyanurate (polyiso) insulation with the publication of updates to the 2015 The NRCA Roofing Manual: Membrane Roof Systems.
The new NRCA recommendation for polyiso R-value is based upon testing by NRCA on current generation polyiso roof insulations.
The new NRCA polyiso R-value recommendation is:
Polyiso R-value = 5.0 per inch thickness in all climate conditions.
We are pleased to announce the availability of updated Foam-Control Nailbase 2-Ci and Foam-Control CLIMATE 3-Ci literature and installation instructions.
An adjustment to the installation method for Foam-Control Nailbase 2-Ci and Foam-Control CLIMAE 3-CI has been made with this update. Both products are now required to be installed perpendicular to framing members. The update literature and installation instructions include language on the new perpendicular to framing installation requirement and also illustrate this method of product installation.
Posted in Literature
Tagged 2-Ci, 3-Ci, CLIMATE, climate 3-ci, EPS, EPS Foam, foam insulation, foam-control, Foam-Control EPS, installation instruction, nailbase, nailbase 2-ci
We are pleased to announce the availability of new individual Foam-Control CLIMATE TechData literature pieces. Now available are individual TechData sheets for Foam-Control CLIMATE 100, 130, 150, 250, 400, and 600.
The individual Foam-Control CLIMATE TechData sheets can be used when you are looking for technical data on a specific Foam-Control CLIMATE product.
We are pleased to announce the availability of a recently published document from the Building America program of the U.S. Department of Energy. The new document, “Measure Guideline: Incorporating Thick Layers of Exterior Rigid Insulation on Walls”, provides the building science behind installing thick layers of insulation on walls to meet the latest in continuous insulation (ci) building code requirements.
The document is a great reference document that complements existing Foam-Control literature and Technical Bulletins.
The new document is available in the Foam-Control Literature Library at http://www.foam-control.com/library/literature/literature-insulation/
We are pleased to announce the availability of an updated Foam-Control Long-Term Thermal Resistance (LTTR) brochure providing R-value test data on commercially available Polyiso and XPS insulations. The brochure was previously available with R-value data up to an age of 6 months. Now R-value data is available up to an age of 12 months. And, the R-values of the Polyiso and XPS continue to decline.
R-value data was obtained by tests conducted at an ISO 17025 accredited laboratory using ASTM C518, “Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus”. Three 2” thick Polyiso and two 2” thick XPS commercially available insulations were obtained from major industry suppliers. The insulations were tested immediately upon receipt and at regular intervals thereafter for 1 year. R-value data was obtained at mean temperatures of 75 F and 40 F.
The R-value data obtained raises questions on the performance of Polyiso and XPS as they age and when used in cold climates.