Hardie board siding

1

Just a question to make sure im correct in my process for washing hardboard/plank

Test spot your mix if nothing happens apply as normal and rinse as a regular house wash ?

2

I like to test with a LOT stronger than I’ll be using. Usually just spray a spot with my pump up which is usually just straight SH or 75% SH. Do it when you first get there, let dwell for 10-15min while you’re setting up. Rinse, If no problem by then, usually you’re good to go. With HW mix may get a delayed reaction. Also, if it’s a newer house, most builders around here use the pre-painted baked on finish and have never had a problem with any of those colors. But test anyway, lol.

3

Yea the house was built in 2016 …guess would be better using a 6% test spot …ive never used chemicals on hardy siding before ive always just washed away clay and dirt from new construction

4

I’ve gotten to love Hardie board siding, lot easier to clean, don’t have to worry about leakers from all the channels, flashing, weep holes, etc you have on vinyl. I use just a slightly weaker HW mix since most the time it mainly just the gutters and soffit that need much.

1 Like
5

I’m with @Racer, I’ve enjoyed washing Hardie. Just do a test spot and wash away. I haven’t had an issue yet.

I test with about 6% with no surfactant from a pump up. Dwell ~10mins then wash with my normal HW mix. I over rinse most of the time just to be sure.

6

Thanks …i know the organic pants have been messing up people just wanted to make sure i had thr basic operation down first …i have only done a handfull of hardyboard 95%is vinyl in my area