Warranty

Not always, but it is usually best. Primarily, it aids in assessing the condition of the roof's substructure. It is not uncommon for us to find unknown dry rot and pest infestation at the time of tear off. With the roof removed, these problems can be addressed right at the source. Please note that any irregularities in the existing roof will more than likely show through new roofing. With some types of roofing, local building codes limit the number of layers allowed.

River Roofing does roofing all year round. It usually only takes 3-6 hours to actually tear off the existing roof and apply water tight felt paper. Start to finish, a roof is usually completed in 2-3 days. The new roof itself can often be installed during inclement weather.

Estimates are free and they are good for 15-30 days. Past 30 days it is best to call us and ask if a re-estimate is needed. Often an estimate will be good beyond 30 days but this depends on material costs. You are welcome to call for an appointment, an estimate, or complete our convenient contact form

We consider a "flat" roof to be a pitch of 3/12 or less. There are methods available to apply standard roofing to lower pitches. Special waterproofing underlayments may be applied or maybe a type of metal roofing would suit your needs. At some point it is best to go with a roofing system designed for completely flat surfaces. After assessing your situation we would be more than happy to advise you on the best options.

Moss is an all too common problem in this area. To remove existing moss you have a couple of options: sweeping the moss off directly or using a "moss killing agent." The latter method usually involves sprinkling a powder over the problem areas which dries out the moss. It is best to keep on top of this problem with annual cleanings. If you prefer, there are professional companies listed in the yellow pages under Moss Control. There are special composition shingles available for installation made with "algae inhibitors" impregnated into the material to retard the growth of moss for up to 15 years.

River Roofing provides a standard 5 year labor warranty on residential roofing. A roofing materials warranty is only as good as its manufacturer. Some manufacturers have an up front warranty for the first through the tenth year. They will pay for labor and materials to replace any defective shingles. The roof must be installed to a manufacturer's specifications to qualify for the warranty. Most warranties are transferable to new owners, but it is always a good idea to ask about your roof just to make sure. River Roofing Workmanship Warranties are always transferrable to new property owners. 

River Roofing has developed techniques for eliminating 99.9% of the roofing debris from reaching the ground. We understand your concerns and we take great pride in leaving your property and landscaping in pristine condition.

Absolutely. We buy direct hand-split, re-sawn and edge trimmed shakes from one of the last quality shake mills in Oregon. The grain is tight and straight. Roof life expectancy is 25-30 years.

A laminate is composed of two shingle strips glued together in a way that creates a random appearance. They are rated for 25, 30, 40 and 50 years depending on the quality and thickness. The weight per square is much greater than a 3-tab type. The 3-tab shingle is a one layer, flat shingle. It has vertical keyways (slots) across it to create its pattern. It is available in 25 and 30 year ratings.

Condensation is most likely your problem. Vaulted ceilings are prone to this problem and may need to be vented, if possible, at the ridge and eaves. A moist crawl space can produce 20 gallons of water vapor per 1000 square feet and should be covered with 6-mil visqueen. Also, plants, bath fans, and other humidity all contribute to condensation problems. Another possibility could be plumbing leaks from toilets or sinks and the piping that connects to them.

The end result depends on the age, workmanship and quality of cedar used and the power and skill of the washer. We often see shake roofs that have been improperly pressure washed, causing unnecessary damage and resulting in leak problems the following rainy season. If a roof is older, it should be carefully assessed to see if pressure washing or replacement would be most cost effective.

We would be happy to give you an estimate for pressure washing and treating your tile roof. If the moss problem is severe, an application of a "moss killing agent" should be applied a few months before roof cleaning so that the agent has time to work and kill most of the moss. This makes it easier to remove and less likely any moss root structure remains after cleaning. If desired, a second application of treatment could be applied after cleaning to retard moss recurrence. If the moss is not extreme, or if other algae/lichens are present, cleaning the roof with other cleaning agents and then rinsing or pressure washing may be effective.

Many existing roof substructures will support a new tile roof. Engineering specialists are consulted to ensure proper framing is present or could be added.