If there are any pros to overlaying a roof it s saving a little bit of money.
How long does a roof cover over last.
So read on to learn how long different types of shingles are likely to last so you can judge the lifespan of your roof.
The columbus day storm of 62 that hit the pacific northwest with wind gusts of 160 miles per hour is an example of how nature plays a role in how long your roof will last.
Whether you re putting a roof on a new home or your existing roof requires a total makeover there are many materials available.
Adding new roofing over old sometimes called a re roof is possible only with asphalt shingles also called composition shingles.
20 40 or 50 year shingle will not last their designated years either.
However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life.
Won t last as long generally speaking the shingles that are laid over the old roof won t last as long as their natural lifetime due to extra heat trapped by the added layers.
These rubber roofs may last 20 to 40 years.
That said standing seam metal roof will last well over 50 years without problems if installed properly and with the seamless 24ga coated steel.
You can imagine how a worn roof would fair against winds of that speed.
The shingles likely won t last as long so the job could actually end up costing you more in the long run.
The most common flat roof material on residences is ethylene propylene diene monomer.
It is a common misconception and a point of confusion for many homeowners.
This provides added protection against ice dams.
But no matter what roof style you have metal roofs can be an attractive option because of their longevity minimal maintenance and energy efficiency.
High winds excessive sunshine and rapid temperature changes can cause roofs to deteriorate sooner.
But before we get started one thing must be clear.
You can t do it with wood or slate for example and you should never mix materials such as laying asphalt shingles over cedar shakes.
Where i live in south dakota the average asphalt shingle roof will last an average of 7 10 years because of quick temperature changes and hail.
30 year shingles also known as laminated dimensional or architectural shingles typically do not last 30 years.
Some roofers install a layer of waterproof shingle underlayment wsu over the existing shingles at the eave end as would be done for a roof laid on bare sheathing.
These estimates of how long a roof will last are for normal environments.
A 30 year roof will last 30 years right.
But because of the amount of prep work involved in overlaying a roof properly any savings are usually modest maybe 25 percent compared to a new roof.
This is great if you need a new roof immediately or if you don t have a lot of money to spend on lodging for the duration of the project.
