Join the MRA | Member Login
Find a Professional
Sign Up Log In Add New Topic

TOPIC: Installation Process

Installation

Return to Installation Process

Return to Archive

Return to Forum

Can I install metal roofing directly onto asphalt shingles without laying down firring strips?
Guest User

4/20/2001
My house already has two roofs (two layers) wont I still have to remove both layers before putting down the new metal rood?
Guest User

5/8/2001
Is there anywhere I can get instructions or an installation manual for installing a panel metal roof? I'm a carpenter from up north, and have done many Cedar shake and asphalt shingle roofs, but I'm completely lost with these metal roofs and would like to put one on a home in Florida. Please help if you can. Thanks for your time. Sincerely, Chris Capp
Guest User

5/9/2001
I own a 1986 manufactured home - 76' long with a metal roof, I am not sure what exactly the pitch is but it is your standard pitch on a manufactured (mobile) home. Do I need to raise the pitch first?
Guest User

5/11/2001
when installing metal roofing, how do you deal with plumbing vent pipes extending through the roof? How do you make these water tight?
Guest User

5/13/2001
Regarding roofing over asphalt without using furring strips. This depends upon the type of metal roofing being used. Flat pan vertical seam panels will need a flat surface or furring strips. This is to prevent the underneath asphalt shingles from eventually "reading through" the flat pans in the metal. If you are using a shingle, tile, or shake profile metal panel you probably will not need to install furring strips unless the overall roofing system normally requires them for attachment. Hope this answers your question.
Tom Black
Metal Roofing Alliance

5/14/2001
Most building code jurisdictions would most likely require removal of the old roofs before application of the third roof. This is often the case with metal also even though the metal weight would probably not be a problem. Best to check the code in your area first.
Tom Black
Metal Roofing Alliance

5/14/2001
Many styles of residential metal roofing are suitable for installation directly over existing shingles. Other styles do require battens (firring strips) for installation and proper fastening. The best advice is to find a metal roof product that best suits your needs in terms of aesthetics, durability, and other benefits, and then make sure that a qualified, experienced installer puts it down for you. Todd Miller
Todd Miller
Isaiah Industries, Inc.

5/14/2001
The low weight of metal roofing does encourage its application over existing shingles. While national building codes allow for only two layers of roofing, local building inspectors will sometimes waive this requirement once they understand the weight factor involved with metal roofing. In many cases, a new metal roof may add no more weight than was on the home when the last roof was installed, before it lost weight due to lost granules and oils evaporating from it. Todd Miller
Todd Miller
Isaiah Industries, Inc.

5/14/2001
Most metal roofing manufacturers do offer installation manuals for their products. Several manufacturers also have installation training "schools" available for contractors to attend. If you go to this website:http://www.metalroofing.com/members.cfm?action=about you can then link to various individual manutfacturers and request information specific to their products. Todd Miller
Todd Miller
Isaiah Industries, Inc.

5/14/2001
Many metal roofs require a minimum 3:12 roof pitch. This is, generally, the same pitch required by standard shingles. It means that, for every 12 feet the roof goes back on the horizontal, it must rise at least 3 feet. There are metal roof systems, though, that are designed for lower pitched roofs, If you go to this site:http://www.metalroofing.com/members.cfm?action=about you can link to the manufacturers of various metal roofing materials Todd Miller
Todd Miller
Isaiah Industries, Inc.

5/14/2001
Most commercially available pipe flashings will work with most metal roofing systems. However, in many cases, manufacturers will suggest a style or two of pipe flashings that are ideal for their products. Also, some experienced metal roofing installers are quite adept at field-forming pipe flashings from the same metal that is used to produce the roofing itself. Todd Miller
Todd Miller
Isaiah Industries, Inc.

5/14/2001
I've talked to two different contractors - one of which told me insulation is not installed under the roofing (vertical panel), and the other told me that insulation is absolutely installed under the roofing - which is it?
Guest User

5/16/2001
Insulation boards are installed under vertical metal panels everyday across this country. Check at your local lumber yard for the recommended insulation board in your area. Dick Bus
Dick Bus

5/16/2001
Insulation boards are installed under vertical metal panels everyday across this country. Check at your local lumber yard for the recommended insulation board in your area. Dick Bus
Dick Bus

5/16/2001
There are times when it may be beneficial for you to install new insullation under your new metal roof. You can add a substantial R Value by using a product know as ISO.The proper name is Polyisocyanuate. It comes in standard 4' x 8' sheet with thickness's up to 4" which will give a R Value of 30.If you require more you may install in two layers.If using two layers you will get a greater R value..example 2 layers of 4" will equal approx a R value of 70.This would be extreme.Most homeowners I have dealt with install one layer of 1.5" which will give you a R Value of Approx 20.The choice is really up to you whether to install insulation.It is not required but benefit you in the future. :)
Guest User

5/16/2001
I'm considering a new 29 gauge classic rib galvalume roof. It will be screwed into the wood decking. I was told that furring is not needed, then someone told me they wouldn't install it unless there was furring down first. Which one is right? The current roof is 5v crimp tin & will be coming off before the new roof is installed. Any help would be appreciated. I would hate to spend 20k on a roof & have it done wrong.
Guest User

5/31/2001
My garage has an addition on. The garage is a pitch and the addition is a pitch, two differant pitches. Is there some special flashing; rain gard[snow] that they make, for where the pitch changes?
Guest User

6/6/2001
You will find that all metal roof systems have flashings and methods for handling pitch changes such as this. The exact method does vary from product to product. In some cases, the flashing will have to be special-made (or made on the jobsite) to meet the exact angle. Also, along these lines -- most metal roof systems specify minimum pitches upon which they should be used. Minimum pitch varies from roof style to roof style. Please make sure that the product you choose is appropriate for your lower roof pitch. In some cases, one product can be used on the main roof with a specially-designed low-pitch roof product used on the lower roof. Todd Miller
Todd Miller
Isaiah Industries, Inc.

6/7/2001
Guest User

6/9/2001