The Roof Cleaning Institute Of America Training & Certification Forum
"Find A Certified Roof Cleaner Directory"

Always gently spray the top of your roof at the ridge cap downwards.

Never, ever, spray from the eaves or gutter line and work your way up.

This is a Cardinal Rule and a BIG NO-NO.

Why?
 

Simply because, you could get the roof cleaning solution and or water
up underneath the shingles.

Two issues can arise if this does occur, the first being that moisture may find a way into the sheathing and that moisture can open the door for molds, mildew and etc. to find their way inside of the home.

Doing this may ALSO affect the glue under the shingle and may soften it so when stormy season arrives, the roof  shingle could more easily become dislodged by a high gust of wind which may possibly end up removing shingles that may have become loosely attached, from lack of the glue properly bonding securely all together.

The glue that is placed on the 3 tab section of the underside of every roofing asphalt and fiberglass roofing shingle is designed to heat up with the sun's warmth and glue itself to the shingle row below and under it helping to secure the shingle to the next course of roofing.

If this glue is compromised by allowing our cleaning agents to deposit themselves under the shingle layer, this is not a good scenario.

The easiest way to avoid this is to always apply your cleaning agent from the ridge cap or top of the roof and work your way down, as previously stated

Here's a tip:

You ought to always be sure to rinse off the downspouts and the gutters out thoroughly so as to remove the corrosive cleaning agents after any and every roof cleaning.

This protects the sealants from dissolving in the seams of the gutters, especially on the do-it yourself type gutter systems.

Even on the seamless gutters, there are still sealants being used to join the corners and edges and downspouts and so,  these areas need to be protected from prolonged exposure to any corrosive solutions  from being able to attack the metal gutter components.

Hope this helps someone here on the RCIA to avoid having to repair or re-seal a customers gutters or shingles.

-- Edited by Roof Clean USA Georgia 229-227-0000 on Monday 14th of September 2009 01:00:44 PM