Category Archives: Washington

Flat Roof Ponding

Is It Acceptable to Have Ponding On My Flat Roof?

By Allen Sensel

Moderate Water Ponding


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.


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:

“ 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.


“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



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,

When Your Washington Roof is Damaged, Know Your Insurance Claims

Greetings from sunny Colorado, Washington home owners and roof shoppers! I’ve come to the excellent Chase Construction blog today to help you deal with the sometimes confusing process of roof insurance claims. If you experience roof damage, you should know a bit about the claims process for Washington roof damage.

There are many myths and inaccuracies about roof damage and insurance claims. The first thing you should do if you believe your roof has damage is schedule a roof inspection. Your roof can be damaged by wind, storms, hail, tree branches, and more. Even if you don’t see any missing shingles, a local roof contractor can tell you if you have a possible claim.


TLeak repair for Tacoma Washingtonhe biggest myth about roof insurance claims is that your insurance company will raise your rates if you file one. This is simply not true! Insurance companies are used to dealing with roof claims and, especially if your area suffered from a recent storm, your neighbors are likely making similar claims.

Your roofer will work with your insurance agent to determine several key factors for your roof claim:

RCV (Replacement Cost Value): This is the estimated cost for repairs, determined by your insurance company.


If your roof condition has deteriorated, it will result in Depreciation. Depreciation means your roof is worth less than it used to be due to wear and tear over time. Your insurance agent will deduct the Depreciation from the RCV to create the Actual Cash Value (ACV). This is how much your roof is currently worth.


Deductible: The deductible is simply the amount of the claim that you, the homeowner, are responsible for. Your deductible should be predetermined in your homeowner’s insurance policy.


To figure out your final claim, your insurance agent will subtract your deductible and any depreciation from the Replacement Cost Value. They then add the Base Service Charges, which are extra costs reimbursed to your construction company for travel time and setup.

In the end, you only have to worry about paying your deductible. You will sign over your insurance checks to the contractor to pay for the total cost of your new roof.

Protect Your Tacoma Roof

You should also check your policy for exclusions and other roof related items. Your insurance might exclude certain coverage toavoid taking on extra expenses. Common roof exclusions are:

Complete replacement. You can almost always get your roof repairs covered, but sometimes full replacement is refused. Usually damage from neglect or poor maintenance leads to denied coverage, but storm damage or other damage from external elements, like trees, will be OK.

Material restrictions. Some insurance companies will deny claims for new wood shake, slate, stone and/or tile roofs. Wood shake is denied most often because it isn’t as durable and can be pricey. New  and “green” roofing materials can be denied because insurance companies don’t know what to expect from them in the future. Your best bet for a roof claim is to replace your roof with asphalt shingles or metal roofing.

Roof age. The older your roof is, the less likely it is to be covered by insurance. Old age makes it hard to tell where damage came from. If you buy a new home, you should make sure there aren’t shingle layers stacked on top of each other. Sometimes roofers install shingles on top of the old ones. This saves on labor but is likely to result in denied insurance claims down the road.

It can seem like a big pain when your roof is damaged, especially in the case of severe damage. But with this knowledge under your belt, you’ll be better prepared to deal with your insurance claim process!

This guest post was written by Metro Construction, a Denver roofer and general contractor that serves Colorado and Wyoming. Metro offers roofing, insulation, siding, gutters, windows and painting. One of only 120 Platinum Preferred contractors with Owens Corning in the United States, Metro is dedicated to top of the line service and customer satisfaction.

Determining Your New Roof System

Selecting Worthwhile Components For Weather-Tight Protection

by Allen Sensel

Today, selecting a new roof system might be as easy as finding the right certified contractor to install it for you. Several questions might come up, like which products and manufacturer to use. Typically, the best approach is to do some thorough research and I’m here to help explain the steps and guide you in the right direction. We’ll talk about picking and choosing the right sheathing, roof metals, underlayment, leak protection, and an asphalt system with their relative components to give your roof a great curb appeal and efficient protection.


The first protective layer to any house is typically the sheathing, which you will most often find to be conventional plywood, synthetic decking, or particle board. The sheathing is fastened directly to the rafters, covering your attic or crawlspace. Older houses with shiplap (3 to 8 inch wide, tongue and groove boards) are typically sheeted over to create a solid substrate to nail the layers of your roof to so that the system can qualify for a manufacturer warranty.


The purpose of using metals in an installation, is to protect the outermost edges of your roof from rot and to keep running water out of the valleys. Metal is usually 26 gauge and painted white, brown, or black for different accenting options, however, you can also have your metal ordered in other colors to perfectly match your color preferences.


Once the sheathing and metals are attached, the next step is applying an underlayment. The two most common types are referred to as #15 or #30 felt paper (referencing 15 or 30 pounds per roofing square [100 ft ²]). This material is asphalt saturated and supplied in long runs, making it cost effective. A far better deck protection would be a synthetic underlayment, like IKO’s RoofGard-SB. This kind of material can greatly increase the life of your plywood deck while keeping moisture from getting into your house.


Leak protection is the next critical component to a complete roof. National building code requires it to completely cover any roof section below a 3/12 pitch and along eaves in the northern regions. This helps keep wind-driven rain and standing water from ice dams from seeping into the attic and creating a significant problem. Most certified roofing contractors will, on the other hand, suggest placing this membrane among all critical leak areas of the roof (i.e. along rakes, in valleys, and around skylights and chimneys). IKO utilizes a glass fiber reinforced, self-adhesive membrane called StormShield in their roof systems, which meets most building code requirements and exceeds standard specifications for a quality product.


Composition roofing is the last product to top your roof off and is also one of the most noticeable pieces of your house, so choosing a style and color isn’t necessarily the easiest to do. One of the benefits of using a certified contractor is the selection process. Most will help you with the guess work and eliminate your need to dive into some extensive research about product comparison. The style of your new shingle will ultimately affect how your roof stands out. The latest, most popular style is the architectural laminate shingle, like the IKO Cambridge system. The premium designer systems, IKOs Armourshake, Crowne Slate, Grandeur, and Royal Estate can offer your house a long lasting, eye-catching addition to your home. A basic asphalt system is comprised of a starter course along the eaves and rakes, the main field shingles, and hip/ridge cap shingles to accent the prominent peaks. IKO offers an extensive line of products for a wide range of applications to suit your design needs, and a local certified contractor to get the job done right.


   As a local certified Puyallup roofing contractor, we’re here to help you select and install a quality roof system, and that’s why we’re a certified ShieldPro Plus+ Installer with IKO Manufacturing, Inc. We specialize in flat roof and composition systems for residential and commercial purposes. Call us at 253-445-8950 for a free estimate or drop by our website at


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