Removing Moss To Prevent Tile Roof Damage

Posted on: 10 March 2015

Tile roofs are beautiful, coming in a range of designs and colors to complement different homes. So if you've chosen a tile roof for your house, you want it to last. One of the most important parts of maintaining a tile roof is keeping it free of moss and algae.

Will moss damage a tile roof?

While moss is not directly damaging to your tiles, which are very sturdy, it can cause drainage problems if allowed to build up. This leads to water backing up on your roof, which can lead to roof leaks. In areas with cold winters, this water may freeze and damage tiles. Excessive moss can also affect how well your roof reflects the sun and keeps your house cool in the summer. Because of this, periodically removing built-up moss is a good idea.

How can moss be easily removed from the roof?

Some companies offer pressure-washing to blast moss off of tile roofs. While this is a simple option for cleaning a tile roof, it must be done very carefully to avoid damaging the tiles. If the pressure used is too high, it can scour the surface of the tiles, affecting the finish and shortening the lifespan of the tile. If you choose to have your roof pressure-washed, it's important to choose a company experienced with tile roofs who can do a gentle job.

What alternatives to pressure washing are there?

Luckily, there are more ways to clean moss from a tile roof than pressure washing. In fact, it's perfectly possible to scrape the moss from the roof. By using a trowel, a rubber scraper, or even a stiff brush, dry moss can be pulled off the roof fairly easily.

Depending on the type of tile, the pressure from walking can be damaging, so walking on tile roofs should be minimized as much as possible. To prevent accidental cracking of roof tiles, moss scraping can be done by attaching the preferred tool to a long pole. It can be difficult to do this yourself from a ladder, so renting an access tower or hiring a contractor with equipment may be preferable; for tall homes, a basket crane may even be used.

How can moss growth be slowed or prevented?

While some amount of moss is inevitable, thorough cleaning can slow the spread of moss; the more thorough the cleaning, the longer you can wait between cleanings. However, there's one more thing you can do to help control moss and algae: fungicide.

Bleach is one of the most commonly used fungicides for cleaning tile roofs because it's easy to find and use; professional companies may use more specialized moss-killing chemicals. Spraying fungicide onto the roof kills any moss left behind by scraping or washing and delays regrowth. By routine cleaning and chemical treatment, you can keep your tile roof in good condition for as long as possible. (For more information, contact Allied Roof Cleaning)