Category Archives: Recent Projects

Grand Canyon Roof Installed In Maple Valley WA 253-445-8950

Recent Roofing Project In Maple Valley, WA

Maple Valley RoofersIts the joy of every roofing contractor to  install a premium designer roof on a custom home. Chase NW just completed one of those projects in Maple Valley, Washington. Aside from a great looking roof, the greatest testimony is really how the home owner feels about the finished product and the process of re-roofing their home. This particular home owner was very pleased with our workmanship, and was kind enough to send us the picture below and give us a review on Google. Thank you sir!

The Roof

Maple Valley Roofing Contractor

The Project

This was a great project for our team. This roof is a 10/10 pitch and had a wood shake roofing system with skip sheathing. The total area of the roof was just over 5,200 sq feet.  We tore-off the old  system and re-sheeted the entire surface to create a solid substrate for the new roof. We utilized a GAF complete roofing system including factory starter, ridge, leak barrier, GAF Grand Canyon shingles, flashing’s vents, and valley metal. We also topped it off with an upgraded system warranty that will protect every component on the roof for 50 years!

Hire An Expert Roofing Contractor In Maple Valley, WA

Chase NW is a licensed, bonded and insured roofing contractor in Maple Valley, WA. We specialize in all types of roofing applications. If you have an upcoming roofing project or need budgetary numbers contact us today at 253-445-8950. You can also fill our our free roofing estimate for Maple Valley form and we will respond in a timely manner. We are certified to install composition shingles, wood shakes, metal roofing, torchdown, single ply slate and tile. Call today and experience the Chase standard.


View Larger Map

Flat Roof Ponding

Is It Acceptable to Have Ponding On My Flat Roof?

By Allen Sensel

Moderate Water Ponding

Introduction

There is a lot of speculation with older building designs and how their flat roofs have a tendency to collect pools of standing water referred to as ponding. The purpose of this report is to provide clarity for a commonly misunderstood notion that a flat roof, whether it’s asphaltic built-up, modified bitumen, or any kind of single-ply membrane, should not bear any kind of collection of rain water. I will provide brief examples from the IBC, U.S. Department of Housing and Urban Development, and Factory Mutual, all of whom mandate construction and renovation standards to comply with regional climates,weather patterns, and safety.

Definition

Ponding water, as described by the IBC and recognized by the U.S. Department of Housing and Urban Development, is water that remains on a roof surface longer than 48 hours after the termination of the most recent rain event.

Standing Water

This explanation from the IBC can also point out that directly following persistent rainfall, water is not considered standing until after 48 hours of dry weather, after which, can evaporate efficiently at temperatures above 45 degrees Fahrenheit. Only when the same volume of water exists after this period can there be a concern for potential leaks, providing that the roof system was properly installed.  The U.S. Department of Housing and Urban Development elaborates on how building inspectors approach ponding after an installation:

“48 hours before conducting a physical inspection, check the local weather forecast to see if precipitation is expected. If there has been precipitation within 48 hours prior to your inspection, use your judgement in deciding if observable ponding is due to the recent precipitation or because of an ongoing problem. Keep in mind that some flat roofs are designed to allow ponding.”

Concurrent with the size of the roof, Factory Mutual Global explains rain load on a dead flat roof:

“2.1.1.1.7 Roofs should be designed with positive drainage: however, dead-flat roofs consistent with this guideline are acceptable.”

An older building will lack modern specifications for framing slopes a minimum of  1/4” rise per 12” run. The solution to controlling water flow on a dead flat roof, if ponding is still a noticeable concern after following the aforementioned provisions, is designing a framed slope for positive drainage to scuppers and/or bowl drains.

Resources

“Definitions Supplement.” U.S Department of Housing and Urban Development Real Estate Assessment, October, 2001: 3

“Roof Loads for New Construction.” FM Global Property Loss Prevention Data Sheets, September 2006: 3-5

International Code Council. 2009 International Building Code. 2009