Request for Question Clarification by
tlspiegel-ga
on
12 Jan 2005 21:04 PST
Hi hanni05
If my findings are satisfactory, please let me know and I will post
this information as the official answer to your question.
Metal Roofing Installation - Video
http://www.bobvila.com/BVTV/HomeAgain/Video-1105-02-0.html
Bob meets with the President of the Metal Roofing Alliance and
demonstrates installation of metal roofing panels.
Metal Roof Installation
http://www.bobvila.com/BVTV/HomeAgain/BTS-1105-MetalRoofing.html
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Metal Roofing: How to select a Metal Roof for your home
http://www.classicroof.com/Homeowner_classic_products_metal_roofing.htm
UNDERLAYMENT
Metal roofing should be installed without dependence on the
underlayment beneath it. However, metal roofing can develop
condensation on its bottomside during certain climatic conditions.
Therefore, it is jeopardizing the durability of your roof system to
use a product which does not specify a quality underlayment such as
30-pound felt or one of the new polyethylene-based underlayments. If
you're in an area prone to high humidity or salt air and fog, give
special consideration to rust-free metals such as aluminum, copper,
and zinc. Weather conditions can create the retention of condensation
between the panels and the underlayment. Particularly with steel
products which rest on or near the substrate such as standing seam,
5-V crimp, and low profile steel shingles, this condensation can cause
them to rust from underneath. Keep in mind that failures with steel
roofing occur from cut edges on the back side of the metal and rarely
from the front weather side.
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http://www.roofingcontractor.com/CDA/ArticleInformation/features/BNP__Features__Item/0,3241,23751,00.html
Both traditional and modern metal roofing systems are well suited for
breather membranes. Traditional metal roofs suffer from condensation
generally at the level of the felt underlayment or the slip sheet. A
breather membrane can act as both a waterproof secondary roof and a
slip sheet. Modern composite metal roofs suffer from internal
condensation that can eventually compromise the insulation and even
possibly the securement. Breather membranes allow water vapor to
escape by condensing on the underside of the metal roof, dripping back
onto the underlayment and draining to the eave.
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Building a Tighter Roof with Roofing Underlayments
http://www.bobvila.com/ArticleLibrary/Location/Roof/Underlayments.html
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How To Install Metal roofing
http://wv.essortment.com/howtoinstallm_rynm.htm
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Best regards,
tlspiegel
