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How To Stop Roof Tiles Being Blown Off
Wind pressure is a common cause of failure for tiled roofs. As the wind moves over the roof it produces upward forces causing the roofing tiles to rattle or be removed completely.
Contrary to common belief, roofing tiles are not "blown off" a roof. The wind creates an upward force as it travels over the roof, causing the tiles to be sucked upwards. It is important to understand this subtle distinction in order to build a more secure roofing system. Securing tiles against upward lift is the key to keeping the tiles on the roof.
As the wind travels over the roof area, it causes the air pressure on top of the roofing to decrease. At the same time the pressure underneath the roof increases. The increase in pressure inside the loft space results in a positive pressure on the roof tiles. The negative pressure above causes the tiles to be sucked upwards, lifting the tail of the tile. The lower the pitch of the roofing, the higher the forces will be.
If the tiles are being sucked upwards rather than blown, the old method of roof tile fixing may not be the best. Traditionally roof tiles are nailed or pegged at the head or top of the tile. This secures the tile against the force of gravity but has little effect on upward tile lift. In fact the only thing securing the bottom of the tile is the tiles own weight.
Tests in the United Kingdom have proved that a roofing tile clipped or secured at the bottom can withstand 5 times the force of a head nailed roof tile. Tiles can be clipped or wired to ensure the tail is secured against wind uplift. This also stops the annoying rattle or chatter sometimes associated with wind swept roofs. The chatter occurs as tiles are lifted and dropped by the wind vortex. I prefer to use a bead of silicone between the tile courses to act as a second line of defence against tile chatter.
It is important to note here that modern roofing tile clips must be installed correctly if they are to have any effect. Tile clips are usually nailed in close proximity to the interlocking channel. Because of the risk of damaging the tile, there is a tendency to move the nail too far away from the interlock. The clip must be positioned at right angles close to the tile. The roofing clip should be securely bedded to prevent the tile working loose. In my opinion, the old system of wiring the bottom of the tiles is superior to modern clipping. The wire fixes to an eyelet on the bottom of the tile and in between tile courses onto the supporting baton. This has the effect of clamping down the tile. I have re-roofed wired roofs that are over 50 years old and the wire is still clamped tight.
The most important roofing component when it comes to preventing wind damage is the roofing felt. Roofing felt or sarking is placed under the batons before the tiles are fixed. The primary function of all roofing felt is to prevent wind damage. The waterproofing of the paper is far less important than its ability as a wind barrier. The sarking prevents the increase in pressure inside the loft, thus preventing wind uplift. It must be fixed securely with 150mm overlaps. An extra baton should be placed at the point where the sheets overlap to prevent wind travelling between sheets. If the felt is not correctly secured the wind force will be focused on the weak spot causing more problems.
All ridge and hip tiles need to be mechanically fixed in areas prone to high winds. Roofing mortar alone should not be relied upon to hold these tiles secure. Once the bond between tile and mortar is broken the tile can work loose. They should be nailed, clipped or wired.
The areas most lightly to be submitted to wind uplift are the eaves, verges and ridges. In these areas it is prudent to take extra precautions with your tile fixing. Nail and clip all tiles around the periphery.
A little extra time taken at the installation stage will ensure the roofing tiles stay secure in heavy weather. The extra cost is outweighed by the savings in maintenance and piece of mind.
9 Things To Do When Your Roof Leaks
Back in 1989 when I installed my first asphalt shingle there was many changes in the roofing manufacture sector. The end result was down-sizing the weight to accommodate a more flexible shingle. The old shingles in the USA were known as Asphalt roofing shingles or a standard strip 3-tab shingles. At that time there were other shingles on the market known as Standard strip asphalt composition shingles or Architectural shingles called Timberline or heavy weight shingles known as random tab, and three tabs or standard were becoming composition shingles.
The older organic shingles were just simply called asphalt shingles made with number five crude oil with the advent of the fiberglass standard strip composition shingle was born. Owens Corning helped innovate this process. Since they are the largest fiberglass manufacture in America today.
Many of the other shingles manufactures by fiberglass mats from Owens Corning. This was told to me directly from Owens Corning as a result of a factory tour on the anatomy of the shingle required by Owens Corning Certification. Most of the old asphalt shingles have been torn off and they are in land fills now in the US.
The new fiberglass composition shingles are the norm in today's society. I know this because I am a Professional Contractor, not somebody hoping I am right in marketing, although marketing takes precedence more than any other thing for any business model.
Referrals are Always the Best just to let you know my feelings on the subject. I have personally installed many shingles in my life and I have always know the newer shingle to be considered composition because of the composite make up of the materials that have been blended by the various manufacturers today in the US.
If you find true asphalt shingles today chances are they manufactured in a third world country where the resources are limited, the standard strip shingle was the first of this innovation followed by a multitude of several shingle brands. Any and all fiberglass shingles are considered composition shingles by most roofing professionals.
These composition asphalt shingles have fire ratings, wind resistance warranties and failure warranty's based on the fiber glass mat and asphalt fiberglass thickness, granules and algae resistant ratios. The asphalt composition shingle is made to last longer than the old asphalt shingles not to put more weight than the asphalt roof structure can hold according to ICC specification on weight load limitations of roof framing and spans. The asphalt composition is lighter, more flexible and durable than the old asphalt shingle in1989 and previous years.
GAF Elk happens to be largest asphalt roofing manufacturer in the USA and has any brands in the asphalt roofing shingle world. Owens Corning and CertainTeed have a multitude of designer, architectural and standard strip roofing products. The same can hold true with Atlas and Tamco of which all manufacture asphalt composition roofing shingles in the United States today.
GAF/Elk carries the strongest warranties on their roofing materials for their Certified and Master Elite Roofing Contractors. I welcome any and all comments from CARE (Center for Advancement for Roofing Excellence) and the Asphalt Roofing Manufacturers Association of America (ARMA)as well as any National Roofing Contractors Association of America (NRCA), members of affiliates to correct my definition on the difference between asphalt roofing shingles and asphalt composition roofing shingles.
There are roofing shingles that I have seen come and go, such as the masonite shingle, which is a composite material that requires flashing between each joint to seal it off. There are also concrete tiles which I would consider composite since it does not have the slate or clay tile attributes, known as concrete tiles. There is also another material called Mira Vista of which was a fake slate the Owens Corning made that would fall under the composite material that was made of a plastic or a plasticiser type composite material.
At any rate it is up to you to decide what type of roof you would like to put on your home. Every shingle manufacturer in the USA is an asphalt composition roofing shingle. All Asphalt fiberglass composition shingles come with a 20 year to lifetime warranty and anything in between.
Roofing is one of the most important investments you can make. Improper, aged or substandard roofing can lead to a host of other more expensive problems. If you are selling your property, a well-chosen roof can yield a solid return on your investment. Whatever your budget or design desires, whether you want architectural shingles, tile roof installation or something in between, a Roof Master consultant will work with you to make it a reality.
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