It is October, and the cold weather is upon us. Now most homeowners who did not have a chance to replace their leaking roofs during spring and summer, want to get it done now – before he cold weather arrives. August, September and October are the busiest months of the year for a roofing contractor (for us at least) we get many calls and online estimate requests from homeowners looking to install a new IB Flat Roof or a Metal Roof on their home. At least 75 percent of these inquiries, mention that they would like to have a new roof installed before the winter. While we do understand your concern about having a new roof before winter weather comes, I must point out a misconception among homeowners, assuming that a roof can only be installed during the warm months. While this is partially true, due to limitations of specific roof types (technologies), for us, installing our roof systems in the winter is the same as if it was summer – just a little colder.
Which roofs can be installed in the winter and which can’t:
As mentioned before, there are certain types of roofing systems that should not be installed in the winter, and also those that can, without any compromises in quality. Let’s look at them, but first I will divided them into two logical groups - flat roofs and sloped roofs. Also lets establish that by “winter” I mean temperatures bellow 40 degrees F.
Flat Roofs:
When it comes to flat roofing, there are virtually only two systems that can be safely installed in the winter – PVC and TPO. These two are thermoplastic single ply flat roofing products which are installed using the Hot Air Welded seams instead of various types of adhesives.
In the winter, glues and adhesives will freeze, which will distort it chemical composition in one way or another, which can and will cause premature failure. This is why most, if not all liquid roofing products (be it adhesives, or liquid-applied roofs such as acrylic or urethane coatings) should not even be stored under 40 degree F temperatures – never mind being installed in cold weather.
PVC and TPO on the other hand are attached to the deck using mechanical assembly with heavy duty screws and plates, and all seams are sealed using Hot Air welding equipment which usually operates at 800-1100 degrees F. Such high temperatures ensure that even during cold winter months, all seam welds will not be affected by the outside temperature. I do have to mention though that PVC and TPO roofs are not equal or identical. They are only similar in how they look and installed. Besides that, PVC and TPO roofs are very much different and cannot be compared directly. I encourage you to read our PVC vs. TPO roof comparison.
Following flat roof systems should not (cannot) be installed in the winter:
- Modified Bitumen (cold applied or torch applied)
- Any type of Peal-n-Stick flat roofing products, such as GAF Liberty or similar.
The three roof types listed above represent some of the most common roofing systems available on the market today, with the exception of PVC and TPO single ply membrane flat roofs. The PVC and TPO did not not make the list above since the can easily be installed in the winter without and spec violations, or quality reductions. As for the rest of these systems, they are installed using adhesives (except torch applied Mod. Bit. roof) and therefore installing them in the winter will result in leaks and potential roof blow-off.
In example of Rubber roofs, entire system is usually installed with several different adhesives (one to glue rubber to the insulation, on for seams, special seam primers and cleaners, etc.) and EVERY rubber roof manufacturer explicitly points out that their roof should not be installed in temps bellow 40 degrees. I encourage you to read the following heated discussion on Roofing.com forums about flat roofing in frigid north where many contractors, including some from New England, will insist that Rubber can be installed in the winter, by pre-warming the glue and working when the sun is out, so it would warm up the black rubber membrane, for better adhesion. I also was talking to on of the sales reps for a big rubber roof “private label” distributor, who was telling me that winter months installation should be times perfectly – all glue applied between 10 am and 2 pm, only when the sun is out, and then the seams can be done between 2 and 5 pm, provided that all glues and primers are kept warm. My take on it is following: Rubber roof manufacturers clearly state that such roofs should not be installed in less then 40 degree temperatures. Reps will encourage their contractors to install in the winter, because the make a sales commission and contractors will install because they need to stay busy, all the while violating installation specs. The only one at a disadvantage is you – the roof owner and here is why.
Because rubber roof installers have to go through so many additional hustles to install rubber in the winter, while they still have to charge their normal rates or even less, because competition is fierce and there is not enough work to go around, they will have to cut SO many corners to stay a bit profitable. Therefore, what you get is a roof that was installed outside of manufacturers specifications, frustrated roofers installing it, and and potentially frozen adhesives and glue which will most likely result in roof leaks, and warranty claims would likely be denied. Despite the fact that PVC is far superior to the above roof types, if you still choose to have a rubber roof installed (for financial reasons for example), do not do it in the winter.
Peal and Stick roofing systems and underlayment should not be installed in the winter for obvious reasons – they will not properly stick to the roof deck or base ply, making leaks or even blow-off almost certain. Such roofs should ONLY be installed during warmer months of the year.
Sloped Roofs:
When it comes to sloped roofs, the choices are many and very few at the same time. Basically you have asphalt shingles, metal roofing, and other very rare types of roofing material which usually cost at least as much as metal roofs or more. These are Slate roofs, Tile roofs, Synthetic slate, Cedar shingle or shakes and that is about it. Since asphalt shingle is the most used typo of roofing material (merely because it is the very cheapest roof you can find) rivaled by metal roofs on the premium side, I will only consider these two types for the comparison.
Asphalt shingles can be installed in the winter, but extreme care must be taken by roofers installing it, not to bend and crack the shingle as well as not to trap moisture under the shingles. Because of the reality of winter roofing, very often both of the above are ignored by roofers, causing premature roof failures. Also, because asphalt shingle roofs are highly dependent on the proper seal between the overlapping shingles, which requires the solar heat to melt the seal strip, such roofs installed in the winter, often do not seal properly until warm weather rolls around, causing them top leak, and as a result, wood rot often develops under a brand new roof.
Another major limitation of asphalt shingles is its weakness against Ice Dams. Ice and Water (I&W) shield is the most commonly used method to prevent ice dam leaks. First of all I&W fails about 25 percent the time, and because it also requires sun’s heat to properly adhere to the roof deck, in the winter, moisture develops between roof sheeting and underside of ice & water underlayment potentially making it useless.
Metal Roofs on the other hand can easily be installed in the winter without any compromises in quality of installation. First of all, with metal roof it is actually absolutely not necessary, as metal roof sheds water and ice, minimizing ice build up on the roof. Also the interlocking design prevents water from traveling upward. All this renders the ice & water shield useless. At the same time it prevents the proper breathing (ventilation) of the roof deck which shortens its service life. And ultimate goal is that the roof deck lasts as long as the metal roof over it, which in the case of aluminum shingles is a very long time. Therefore, unless you or the building inspector want Ice & Water to be there, I think it is best not to put it on. We use a premium breathable synthetic underlayment – GAF DeckShiled which makes the roof watertight even without a metal roof over it, and helps the wood “breath”.
Cold weather also does not affect metal roofs as they won’t crack due to “improper handling” and metal roofs are designed to allow for expansion and contraction, so the outside temperatures won’t make a difference.
As you can see, IB PVC roofs and Metal roofing systems are the best system to have installed, year round!
If you are looking to replace your flat or sloped roof, we invite you to look at jobs we’ve done around New England. You can also fill out our Roof Estimate request form to get a free price quote for replacing your roof, or use our interactive roofing price calculator to estimate the cost of your new roof.
We constantly update these pages, adding jobs we’ve done recently and those that were done some time ago. It is a slow process as we try to describe each job in as many details, and point out certain common roofing problems and how we overcome them. Soon we will add roofs that we have completed in Rhode Island and New Hampshire, as well as more MA and CT roofing jobs.
Some Massachusetts and Connecticut roofs we’ve installed in the winter:
Flat roof in Lowell, MA – one of the most recent roofs, installed in the beginning of Dec. 2009. Here we removed old epdm rubber roof, which shrunk and pulled away from the walls and roof edges. We replaced this roof with new IB PVC flat roofing membrane, and added 4″ of ISO insulation to improve weather-tightness and energy efficiency of this home.
Flat roof in Andover, CT – this roof was installed in January 2009, right in the middle of brutal cold storm which overtook New England for almost two weeks, and temperatures reached as low as -16 degrees F. There, the homeowner, with help of his buddies, removed the old roof, and fixed the roof deck, and covered the roof with a tarp. We had to quickly come in and install a new 50-mil IB roof, right before another snow storm hit.
Metal Roof in Brighton, MA – an new aluminum shingles metal roof was installed on a roof of a very busy IHOP restaurant, while it was open for business. This large roofing project involved complete removal and replacement of old metal shingles, all plywood decking, which was mostly rotted, replacement of some rafters and installation for new GAF Deck Armor underlayment and a new metal roof. Due to many major snow storms during that winter, this project took almost two month to complete. About same time 2 years ago we also installed another metal roof on an IHOP restaurant in Hyannis, Massachusetts.
Category: Cool Flat Roofs, Metal Roofing, Roof installation & repair Comment (0)October 8th, 2009
