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MezzoAnna

08:01AM | 08/13/02
Member Since: 08/12/02
2 lifetime posts
Bvmisc
I have to wash the exterior of my house due to some mildew and soot from my neighbors' chimneys. I also have to replace the windows on the second floor. I'm thinking it would be better to change the windows first and then wash the house as this would be a good test of whether the windows would leak or not. Does anyone have any comments or ideas on the subject?

octoruss

10:06AM | 11/04/02
Member Since: 10/31/02
6 lifetime posts
I can't suggest if you do the washing before or after the windows (although it does make sense to do it afterwards)...

But when you go to wash the house, rent a pressure washer that has a detergent intake. Use a bit of TSP (trisodium phosphate) in with the water flow according to the directions on the label. Just be sure not to use too much pressure! Adjust the water pressure so that you are using the minimum amount necessary to clean the house. It is a very common mistake for contractors using pressure washers to use too much power, and then you end up with water in the soffits, under the siding, in joints, etc. If water is seeping in anywhere, it is too much pressure.

rpxlpx

03:50AM | 11/05/02
Member Since: 03/13/00
1675 lifetime posts
I want to echo what octoruss said about too much power. The first time I pressure washed my house I didn't know any better and used too much pressure. I got water under the siding. If possible, spray down or horizontally, rather than up.
If you want to avoid high pressure, I have had excellent success with a product called Jo-Max. You mix it with water and bleach and spray on with a garden sprayer - no pressure. Let it sit for a little while, then rinse off with a garden hose.

MezzoAnna

04:00AM | 11/05/02
Member Since: 08/12/02
2 lifetime posts
Thank you both for your responses, I contracted with a company here that does nothing but powerwashing of homes, commercial buildings, 16 wheelers, commercial kitchen equipment etc. and they guaranty that they will remove the mildew or they come back as many times as necessary within a year. I'm glad I used them, because they washed the house on 9/11 and I'm seeing signs that the mildew is returning or never completely removed. My question related more to timing since I'm having windows replaced. I now have another issue, since I have new outside trim which is pre-primed and won't be able to get it painted until spring, how do I deal with having the house re-washed? I suspect I'll probably have to have them put one coat of paint on the new trim before they wash again. Any thoughts?
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