Multiple roofing layers tend to decrease a roof's resistance to hail. Make sure to check local building codes, as some building codes and ordinances restrict the number of roofing layers a house may have. Another issue to consider with wood shingles when applying a new roof over the wood shingles is possible fungus problems. Installation of metal products over existing wood shingles is common as long as proper cuts for ventilations are observed.

Installing a roof over the top of an existing roof is generally acceptable under these guidelines: 1) A building cannot have more than two roofs; 2) No wet insulation can be left in place; 3) The roof structure must be able to handle the additional roof load; 4) The new roof must be attached to the roof deck to meet wind loads (it is not generally acceptable to adhere the new roof to the old roof)

Yes. Springhouse Shingles can be installed over your existing asphalt roof thereby eliminating expensive tear off and disposal fees.

For pre-existing conditions we recommend Shingle Shield Roof Cleaner, which is specifically designed to clean roofs prior to application of the roof protector strips. Other cleaning solutions may not be effective against these organisms, and may harm your roof or plants.

Yes, but the preferred method is removal. The Uniform Building Code allows two (2) roofs on commercial (flat) buildings and three (3) roofs on residential(steep) buildings. Removal allows for inspection of the substrate, and the elimination of any wet, rough, and/or unstable existing materials.

Yes in some cases. But you should have a professional roofer inspect the current conditions of your existing roof.

If you are committed to your home for years into the future, a metal roof will offer you much greater value and a lower life-cycle cost than the most common and inexpensive roofing products, even though the initial cost seems higher. This is because you will not need to replace this roof for 50 years or more, whereas on average, asphalt shingle roofs are being replaced every 15 years. We like to say that a metal roof is "the last roof you'll ever have to buy."

the GRP roof systems we use lend themselves to over-roofing (providing the existing deck is in serviceable condition) it is not always necessary to strip the existing roof covering and decking. An initial site survey should establish whether the existing deck should be replaced as per building regulations.

In most cases a metal roof can be installed over composition roofing materials. The condition of the roofing substructure will be a factor and the building codes in your area will dictate the number of roofing layers allowed. Because of its light weight, relative to all other roofing systems, many local codes will allow installation of a metal roof over multiple roofing layers where other systems would be prohibited.

A:A PV system can be installed on any well-structured roof. Typically asphalt shingles are easiest to work with, while slate is the most difficult. If your roof is older and needs to be replaced in the very near future, you may want to replace it at the time the PV system is installed to avoid the future cost of removing and reinstalling your PV system. PV systems are also available that integrate PV cells into the roofing materials themselves.

with any roofing product, the best procedure to use when re-roofing is to tear off the existing roof and use industry approved underlayments to assure the best performance over the life span of the roof. But this can be done. It will not affect the material warranty, but it will affect the wind and fire ratings. So usually the benefits of tearing off out weigh going over an existing roof.

One of the benefits of steel roofing is that is lightweight, which allows it to be installed over existing roofing material. Local building codes and your roofs substructure integrity must be addressed to reveal this answer.

It depends on the type and size of the greenroof. Most homeowners could check a flat or low pitch greenroof. A roofing professional should if it is too large or intensive – you can include a maintenance agreement of at least twice per year with the greenroof contractor/greenroof company. Or you can work out an arrangement with the roof maintenance staff of your building.

Yes, although we do not recommend the application of our product by a novice do-it-yourselfer. By following our detailed installation instructions, an experienced do-it-yourselfer can install Springhouse Shingles with relative ease.

Because of the tremendous number of variables involved, we prefer to not be involved in adding on to existing structures.

We can't provide you with an estimate online. However, Butler Builders? and Roof Dealers are independent contractors authorized by Butler Manufacturing Company to distribute our products and services. They specialize in utilizing Butler? roof systems in reroof and new construction applications. These systems include reroofing over existing metal and nonmetal roofs, slope-enhancing framing systems, and architectural standing-seam roofs.

Murray Shaw Inc. highly recommends the removal of the old roofing material before installing new asphalt shingles. The removal allows a professional to inspect the condition of the existing wood deck and all related roofing components to find any defects so that they can be fixed. Once all repairs are done, new shingles can be installed evenly and effectively.

There are a number of brush-applied, liquid roof coatings available through your local branch, which provide waterproof protection to most conventional roofing surfaces. Contact your local branch for further details.

In order to ensure a safe design, and to accommodate for additional loads, such as snow. Existing decks are not designed to support such loads.