Monthly Archives: September 2012

Cover-Boards: Purpose & Application

by Allen Sensel

Glass-Matt Roof Protection

When putting a low-slope roof together it’s important, as a building owner or engineer, to understand how to control moisture, combat mold, and provide fire protection. Cover-boards offer sufficient roof deck protection that meet these requirement for installing a roof. They can also serve as a purpose for re-covering your roof. These boards provide a clean, smooth surface to attach your next roof system to.

Glass-Mat Roof BoardUSG manufactures Securock, a glass-mat board that can be used on a flat roof for dimensional stability, surface protection, and overall increased lifespan of a structure. When installed correctly, Securock acts as vapor and fire barrier, keeping the roof membrane from developing mold and succeeding in fire standard ratings (rated at the maximum ’10’ with Factory Mutual [FM] Class 1 and a Class A Fire rating with Underwriters Laboratories [UL]). This is a great way to qualify for lower insurance rates as your building is less prone to fire damage.

One of the other benefits to using Securock is its ease of installation. The packaging is efficient and the board utilizes a high-quality, mat-to-core tensile bond, making each piece easy to cut and hand-break. This creates a faster labor work-flow and less of a mess to clean off of the roof surface, which helps to cut cost and keep workers focused on installing a quality roof as a whole.

As a local certified Seattle roofing contractor, we’re all about installing a quality commercial flat roof and so we recommend using USG Securock for our installations. We also specialize in single-ply residential roof systems. Give us a call at 253-445-8950 for a free estimate or drop by our website,

What is single ply roofing membrane, is it right for my home in Seattle?

Single Ply Roofing For Seattle, Washington

Single Ply Roofing For Seattle, Washington

Chase NW specializes in single ply and commercial roofing!

When it comes to roofing in Seattle we all want to know what is the best type of roofing for our home or business. Low slope roofing systems (a roof with less than 3” of rise per lineal ft) can get even more technical with commercial and architectural specifications required by the city building codes. Its important that you use the best material for your roof design. As a commercial roofing contractor in Seattle we have seen a huge spike in the popularity of single ply roofing systems.

What is single ply roofing membrane

Single ply flat roofing membranes are sheets of strong, flexible material made of synthetic polymer. You will often hear the terms of different types of single ply like “TPO”, “PVC” or EPDM. Single ply comes in different thicknesses that determine the roof life and the length of warranty that a flat roofing contractor in Seattle can offer. The most common thickness or millage are .45, .60, .80 and now EPDM comes in a .90 mil. The membranes come most commonly in white, black and gray, but is also available in custom colors like green, red, tan and other colors.

Sustainable roofing with single ply membranes

Single ply membranes in white have a high solar reflectivity rating. This helps to reduce Single ply systemover heating in a given structure and lowers energy bills. This type of Sustainable roofing often qualifies for special building deductions in Seattle and or the Energy Star federal tax credit.


Single ply membrane comes in rolls ranging most commonly from 4’ to 10’. There are fire rated slip sheets and cover boards that can be used to attain the necessary fire rating you need to insure your building and meet codes. Typically you will run your membrane in the direction of the slope which is either framed in or built using a ridged insulation. The membrane can either be mechanically attached with screws and plates or fully adhered. The mechanically attached application requires welding at the seams. It is commonly stated that the tear strength of the seam weld is stronger than the material itself.


Seattle Single Ply Roofing

Chase NW Roofing is a certified contractor with Versico!

The standard material warranty for single ply membranes such as Versico is 20 years. With special application procedures we are able to offer “complete system warranties” with “no dollar limit” coverage. These no dollar limit warranties are 100% manufacturer backed coverage on material and workmanship from 10-30 years.

Chase Construction North West, Inc is your qualified commercial and flat roofing contractor. We have a wealth of experience installing single ply on commercial and residential structures. For a free quote and consultation please visit our quick estimate form or call us at 253-445-8950.

Thank you for reading our roof life blog. Best wishes from our family to yours!



What Is A Torchdown Roofing System, Is It Best For My Home In Seattle?

Torchdown Roofing What Is A Torchdown Roofing System



There are many choices and material types you can use on your flat roofing system in Seattle. Single ply membranes such as PVC, EPDM, TPO or torchdown are the most common low slope roofing materials. Depending on your roofing systems design one of these membranes might be a better choice than the other. In this consumer education article I would like to shed some light on torchdown roofing systems. Chase NW has been installing torchdown as a Seattle roofing contractor for over a decade.

Torchdown is a reberoid (rubberized) membrane that is modified with an APP weatherized asphalt for water proofing. The material is strong, very durable and has a non-woven polyester mat. Torchdown is light weight at less than 2 pounds per square foot. Torchdown membrane comes in smooth and granulated sheets. The granulated cap sheets come in many colors, some of which are energy star rated and qualify for the Federal tax credit. Torchdown can be used to re-roof (tear off the existing roof and install a new system) or recover (install a ply of torchdown over an existing roof).  Applying the second ply of granulated cap sheet can give you a more aesthetic finish to your roof. The cool colors also reflect the suns solar rays keeping your structure cooler and saving you money on costly energy bills.

As torchdown is a rubberized material it allows for excellent expansion and contraction in the extreme heat and cold a roof can endure. It also adheres very well to metal roof flashings and as they expand and contract the torchdown is in melody with the movement. This flexibility keeps it from cracking and makes it a very effective low slope or flat roofing material.

Low slope or flat roofs

Torchdown is considered a low slope or flat roofing system application. Low slope roofs are qualified by having a roof pitch of less than 4:12 or 4” of rise per foot. It is not recommended by the NRCA or roofing manufacturers to install asphalt shingles on roofs with a pitch less than 4:12. Torchdown is most commonly seen on commercial roofs, but is also very popular and appropriate for low slope residential applications.

The typical standard material warranty for a torchdown roofing system is 10 years and up to 20 years with upgraded system specifications. “No dollar limit” warranties are available on torchdown roofing systems through certified roofing contractors. No dollar limit warranties must be installed to exact upgraded commercial specifications and inspected by the manufacturer with a passing grade. The manufacturer then guarantees not only the material but also the workmanship of the contractor for an X amount of time with a 100% guarantee.

90% complete on a 160 square torchdown re-roof with silvercoat near Seattle, Washington.

Torchdown is applied by an open flame. It comes in rolls of 1 roofing square and can easy be rolled out across the roof. The entire width of the membrane is to be heated adhering the whole roll to the sub deck or existing roof in the case of a recover. An error often made is for a contractor to only heat the seams of the modified Bitumen leaving the remainder of the membrane laying loose on the roof deck. This compromises  the integrity of the waterproofing ability as the seams over time are the first aspect of the membrane that will fail due to weatherization.

Due to its application it should be installed by an experienced roofer. Insurance is required to install torchdown which ensures the safety of both the home owner and contractor. Before you consider utilizing torchdown please contact a local Seattle roofing contractor and get a professional  consultation to make sure its best for your roof system.  We recommend following the National Roofing Contractor’s Association  (NRCA)  regulations for applying torchdown.

We have been providing quality re-roofs in the North West for over a decade. If you are interested in a fee inspection or estimate please call us at 253-445-8950 or fill out our free estimate form.

Contact us and we will get back to you quickly with an effective and affordable solution for your roofing needs.

Chase NW Roofing is factory trained and certified with GAF, IKO, Versico and Custom-Bilt Metals to install almost every roofing application. We specialize in composition shingles, torchdown, single ply, metal roofing, wood shakes, slate and concrete tile.

Don’t take our word for it! Please see what our past customers have said about us on Google Places!