The GutterBrush Blog

Do you need a new roof? Are you trying to decide how to save some money on the job? One way people try to do this is to place the new roof installed over an existing layer of roofing. This technique is quite common in many areas and many roofing contractors don’t see any problem with this method and have no problem trying to sell homeowners on a lay-over or go-over as this technique is called.

Don’t do this. EVER.

Here are the top five reasons laying a new roof over an old one is a terrible idea.

First, there are sure to be areas that have or had leaks and they can’t always be addressed properly

There is a good chance that your old roof had some problem areas including possible leak spots, whether you noticed them or not. Without tearing off the old roof and properly identifying these types of trouble spots and determining where the leak was coming from and traveling to it is impossible to tell what areas of your roof may need some special attention.

Second, any rotted wood under the existing roofing will only get worse leading to an even more expensive fix down the road.

There could be areas that have rotted wood hiding under the old roofing. These rotted areas need to be identified and replaced before a new roof is installed. Obviously if your roofing contractor is only doing a lay-over roofing installation then these rotted areas will remain covered up and only get worse as the years go on. Also the nails holding down the shingles in areas with rotted wood cannot properly do their job and you have a much higher risk of shingles blowing off in those areas.

Third, the eaves, rakes and valleys always need special treatment and not doing so will cause more costly repairs later.

This is a big one. The eaves, rakes and valleys of your house need special attention when your home’s roof is being installed. This is especially important in colder climates like Massachusetts, where we are located. In the winter time the eaves of your house are under attack by Mother Nature, whether it is through ice dams, snow build up, or just the constant freezing and thawing that occurs throughout the winter season. When a new roof is properly installed the roofing contractor needs to put new aluminum drip-edge around the entire perimeter of your roof.

Next they need to apply a 3 foot wide section of ice & water barrier around the perimeter as well as in any valleys on your roof. Then they can begin to install the new roofing. Without tearing off the original roofing there is no way to properly install the new drip-edge or ice & water barrier. On a lay-over type of roofing install, the roofing contractor is counting on the existing products on the home’s roof to still be up to par and be able to handle the winter conditions. All too often the old products fall short whether it was because they have outlived their lifetime, were sub-par to begin with, or maybe they were never there to begin with (all to often the latter is the case with ice & water barrier).

Fourth,  the extra roofing weight is no good for old rafters and can cause structural failure and safety hazards in the structure.

One of the more obvious problems with a lay-over re-roof is the added weight of the extra layer of shingles. On most newer homes this is not an issue, however many older homes have rafters that are considered undersized by today’s framing standards. It is not uncommon to see 2×6 rafter systems on many of these houses. Now in most situations a 2×6 rafter is undersized to begin with and you certainly don’t want to be adding the weight of a new roofing layer on top of an old roofing layer to these already undersized rafter systems.

Fifth, adding a roof on top of another roof will lead to a shorter roof life expectancy.

Most responsible roofing contractors agree that a lay-over roof will decrease the new roof’s lifetime by about 25%. This fact alone means that any money you might have saved by doing a lay-over, as opposed to a tear-off and new roof install, was only a short term savings. In addition, you now have 2 layers of roofing that will need to be removed the next time your roof is done and that will also add more cost to the job

Tearing off the old roof and then installing a new one is always superior to laying a new on on top of an old one. And as always, do not forget your gutter protection system needs!

In Los Angeles, CA all new homes, larger developments and some redevelopments will be required by law to capture and reuse water runoff generated by any rain producing storms. This ordinance will require such projects to capture, reuse or infiltrate 100% of runoff generated in a .75″ rainstorm or to pay a storm water pollution fine that would offset the cost of funding  low-impact public developments. This is an interesting and novel approach to offsetting the negative effects of large scale urbanization by minimizing runoff at its source with small, cost-effective natural systems instead of large and very costly treatment facilities. The process of reducing runoff improves water quality and recharges groundwater while in Los Angeles it will prevent 104 million gallons of polluted urban runoff from ending up in the ocean. The quality of the runoff water can be greatly increased by utilizing gutter protection systems that also act as filtration systems such as GutterBrush simple gutter guards. Clean runoff water can be used in ways that greatly reduce the usage of fresh water. Will the splash in LA be enough to carry over to other states, cities, and towns?

It can’t protect your property from costly damage caused by clogged and overflowing gutters! And for about the same projected price of the Ipad you can protect your entire home from clogged gutters all without a battery or yet another charger! But to be fair there are a whole host of things that the new Ipad can do that a gutter protection product like GutterBrush cannot do. These include: browse the web, read and send emails, load and view photos, watch videos and DVDs, listen to music, play games, read emails and it will run most of the 140,000 iPhone applications. But it still cannot protect your gutters from filling and clogging with debris! Regardless, the newest Apple device is 1.3 centimeters thick and weights 680 grams; it is thinner and lighter than any other laptop or notebook.