Archive for Monthly Mailer

The role of a cover board in commercial roofing – September 2020

Cover boards, as a higher compressive strength substrate directly beneath single-ply membrane, have the unique ability to enhance the overall performance of low slope single-ply roof systems. They do this by enhancing wind uplift, hail resistance, foot traffic, thermal performance and puncture resistance. Cover boards often can be used to increase duration of warranties and/or higher peak gust wind speeds.

Many cover board options exist, including;

  • InsulBase HD and SecurShield High-Density (HD & HD Plus) Polyiso
  • Gypsum (DensDeck & Securock)
  • Composite – SecurShield HD ISO & EPS and StormBase (OSB)
  • Ecostorm VSH – Recycled
  • SecurShield HD RL PolyISO (used with RapidLock membranes only)

Cover board selection considerations:

  • Fastening requirements – many products offer reduced fastening patterns while keeping the higher uplift.
  • Moisture resistance – options range in their ability to perform in the presence of moisture.
  • Handling and cutting – product weight and ease of cutting can decrease installation time.
  • Insulating value – some options provide insulating value, adding additional R-value to the roof system.

With the Midwest’s multitude of weather conditions, including a rare derecho in August 2020, a cover board can help support the roof system while providing added security of the building. Additional information on cover board types can be found at the link below or the Luna and Associates team can help with your specific building needs.

CARLISLE SYNTEC COVER BOARD GUIDE

FM Global Recent Changes – July 2020

FM recently made changes to the ratings calculator within RoofNav and their Loss Prevention Data Sheets to reflect their partial adoption of ASCE 7-16. The main difference is that FM did not adopt the wind maps utilized by ASCE 7-16 and the 2018 International Building Code. This can cause wind design complications for FM-insured buildings.

On February 26, 2020, FM Global updated its Property Loss Prevention Data Sheet 1-28 “Wind Design” to reflect changes in its wind load determination methodology. It is important that the FM wind maps (and not the ASCE 7016 wind maps) are used when inputting the wind speed to obtain the correct wind pressures and wind uplift ratings needed when using FM’s RoofNav ratings calculator. Also, uplift pressures should be calculated per the applicable building code requirements for the project. It is suggested the more conservative of the two calculated design pressures be used.

Also, if you are certain that the project is NOT FM insured, it is highly suggested that you should not use the FM RoofNav ratings calculator to determine uplift pressures.

To view Carlisle’s presentation on this subject, click here.

If you have any questions about ES-1 and how they can be incorporated into your next roofing system, please contact your Luna & Associates Representative.

Detec Leak Detection Systems – May 2020

Leak detection systems have been used for decades in the roofing and waterproofing industries. The technolgy typically uses a wire mesh, probes and electric current to locate breaches in the membrane. Limitations of this technology are that it is most often placed under the top layer of insulation instead of directly under the roof or waterproofing system. This means a larger area would need to be saturated before it could be detected. Another drawback is that these systems do not function with EPDM membranes, which represent a large portion of the roofing market.

Detec Systems has developed a conductive primer called TruGround Conductive Primer that can be used directly under the roofing/waterproofing layer. This primer is roller applied on the top layer of insulation and allowed to dry. For adhered systems, CAV-Grip III adhesive for EPDM and TPO is applied or Low VOC Bonding Adhesive for PVC membrane. The membrane is then adhered in typical fashion. Carlisle SynTec, in partnership with Detec, has done extensive testing with FM and UL to get approvals in their rated systems and also includes it in their Total System Warranty.

Key Properties:

  • Used in Adhered and Mechanically Attached systems
  • Approved for EPDM, TPO, PVC, FleeceBACK and modified systems
  • Patented Detec sensors can be used on horizontal and vertical surfaces
  • Highly mobile nature of sensor equipment makes the inspection process very quick. Allows for inspections to be conducted at various phases during new construction projects and as a final approval before release to the building owner.
  • Inspections can be conducted at prescribed intervals or after significant weather events at any point in the life of the system.
  • Carlisle SynTec FM Approvals with Insulbase Polyiso, Securshield Polyiso, HD Polyiso, Securock and DensDeck Prime (Check for specific assembly)
  • Detec offers traditional wire mesh systems and active monitoring to alert owner the second moisture is sensed in the system.

If you have any questions about Detec or TruGround and how they can be incorporated into your next roofing or waterproofing system, please contact your Luna & Associates Representative.