Commitment To

Cosmos Roofing
Call 650.969.7663
or email at:

1901 Old Middlefield Way, Suite 4
Mountain View, CA 94043
License #785441


Serving Santa Clara
& San Mateo Counties

Cosmos Roofing will perform FREE roof evaluation/inspection with a no obligation estimate for needed roof repairs or replacement. Please fill out the enclosed form and one of the company owners will contact you ASAP to schedule an ON - SITE roof evaluation.
Cosmos Roofing Free Estimate/Contact
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 Flat/Low Pitched
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Roofing Systems Portola Valley

Two very popular roofing options most house owners opt for in their houses are asphalt and metal roofs. While asphalt shingles are made from a combination of fiberglass and asphalt, metal roofs are made from steel. According to roofing systems Portola valley, both of these roofing options has its share of pros and cons.


Steel roofs offer great durability in terms of weather as it is not affected by wind or moisture. At the most, low grade steel may get damaged during installation or in extreme weather conditions like hail.

On the contrary, though asphalt shingles can handle moisture and most weather conditions there is a chance of individual shingles blowing off over time. There is also a chance of asphalt roofs getting scratches in hot weather, or if it gets hit by something. Roofing system Portola valley states that it is however possible for you to walk on either of these roofs without any worry.


Roofers love steel roofs as they can be shaped and painted to meet any design and requirements. Asphalt roofs cannot be customized much, but have a smooth look that goes well with any home.

Though steel roofs reflect heat, they are loud during precipitation. On the contrary, asphalt roofs are quieter but can get hot in sunlight. So be careful if you need to walk on them in warm temperatures.


As asphalt roofs are easy to install, you can do it on your own. If you do hire professionals, they usually charge low rates as they can get it installed quicker than steel roofs. Steel roofs are expensive to install as it is heavy and needs more people for its installation.

Asphalt and steel roofs are great for roof replacement as they can both be installed over another roof. Roofing systems Portola valley states that while it is very easy to replace asphalt shingles, there is a chance of chemical problems arising when different types of metal roofs are used. This is why it is better to avoid using more than one kind of metal for your metal roofing needs.


While asphalt roofs are one of the most affordable roofing options available, steel roofs are rather expensive, and expensive to install. However steel roofs can reduce your energy bills as it reflects heat unlike asphalt roofs, which absorb heat.

Last but not least, roofing systems Portola valley states that steel roofs last as long as your home and thus increases your house value. Asphalt roofs last for only 15 to 30 years and thus have to be periodically replaced.



Cosmos Roofing
License #785441
1901 Old Middlefield Way, Suite 4, Mountain View, CA 94043
Office 650.969.7663
Fax 650.584.3078
Email at
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