Re: asphalt shingles

We once considered asphalt/fiberglass shingles (IIRC, Owens Corning?) but noticed that the wind speed rating was well below the speeds encountered during Typhoon Cosme (~160 kph).

Re: asphalt shingles

We once considered asphalt/fiberglass shingles (IIRC, Owens Corning?) but noticed that the wind speed rating was well below the speeds encountered during Typhoon Cosme (~160 kph).

Correct, here I quote wikipedia on asphalt shingles as follows: The older organic (wood and paper pulp product) versions were very durable and hard to tear, an important property when considering wind uplift of shingles in heavy storms. Fiberglass is slowly replacing felt reinforcement in Canada and has replaced mostly all in the United States. Widespread hurricane damage in Florida during the 1990s prompted the industry to adhere to a 1700-gram tear value on finished asphalt shingles.

Another thing is that asphalt shingles are not made for our hot climate, another quote from wikipedia: Asphalt shingles usually last longer in cooler climates than warmer ones. Thermal shock is one thing that is damaging to shingles (thermal shock is what roofing materials experience when the ambient temperature changes dramatically within a very short period of time). Another factor affecting asphalt shingle roofs is attic ventilation. Proper roof ventilation has been known to extend the service life of a roof.

Shingles should not be applied during cold weather. Each shingle must seal to the layer below it to form a monolithic structure. Thus, when constructing a roof, the underlying exposed asphalt must be softened by sunlight and heat. For this to occur the release tape must be removed just prior to installation. Numerous roofing sites on the internet claim that it is not necessary to remove the release strip/tape, however a look at the patent for the strip repeatedly say that they must be removed prior to installation. U.S. Pat. # 6,924,015 is an example.

The protective nature of asphalt shingles primarily comes from the long-chain hydrocarbons impregnating the paper. Over time in the hot sun, the hydrocarbons soften and when rain falls the hydrocarbons are gradually washed out of the shingles and down onto the ground. Along eaves and complex rooflines more water is channeled so in these areas the loss occurs more quickly.

Eventually the loss of the heavy oils causes the fibers to shrink, exposing the nail heads under the shingle flaps. The shrinkage also breaks up the surface coating of sand adhered to the surface of the paper, and eventually causes the paper to begin to tear itself apart.

Once the nail heads are exposed, water running down the roof can seep into the building around the nail shank, resulting in rotting of roof building materials and causing moisture damage to ceilings and paint inside.

Re: asphalt shingles

thanks for all the posts.it simply means asphalt shingles are not meant for the tropics...unless you want to re roof in 5-10 years.

ganda pa naman sana.

Re: asphalt shingles

Bakit hindi ko nakita ang mga ito two years ago? :(:(:(

Update ko kayo after 3 years.

Re: asphalt shingles

Bakit hindi ko nakita ang mga ito two years ago? :(:(:(

Update ko kayo after 3 years.

Hit and miss lang naman yan joey, hopefully you'll enjoy your roof much longer than 5 years 🙂

Since were in the subject of roofings, we can talk sana more on other roofing materials since there are plenty of other options pa naman. I'll do some research on other roofing materials and post it later when I have time.

Peace

Re: asphalt shingles

ok. tegula naman siguro in another thread.ayos!