Hey all, who has used a SH based cedar shake cleaning mix? I have a 5 year old blackened untreated cedar siding job (not roof) that I'm planning on using a 25% ratio mix of 15% SH and surfactant/water. I know the sq/ft'dge of the project. I just need to figure out how much area I can get out of each gallon of mix to crunch my #'s. siding is a diff. calculation than roofing.
Ed Thompson said
Sep 17, 2014
If I'm reading right thats 3:1. That would be strong. That's almost roof strength. 9:1 should work fine and not as aggressive.
Maverick Contracting said
Sep 17, 2014
thanks Ed, I just dont want to come up short as this is an immense house but were only doing a small part to start that should take an hour or two to do and is remote to my local source. If I have to run out for more SH thats another hour+ lost incl. laborer sitting on his azz.
standard paint/stain coverage per gallon is usually figured as 400 sq/ft but with cedar shake (esp weathered) I get 150 sq/ft of stain so condition and type of substrate varies volume numbers. I know what I get on a asphalt roof but vertical cedar siding of mix Im not sure. In the past we always powerwash'd it.
I will start with an 8:1 mix with extra cling agent
-- Edited by Maverick Contracting on Wednesday 17th of September 2014 11:36:00 PM
Jeff Wible said
Sep 18, 2014
If it is raw blackened cedar, I wouldn't even use Sodium Hypochlorite at all. I would use Sodium Percarbonate mixed at about 1 cup per gallon of hot water then apply with a dedicated pump.
Or I'd use Sodium Hydroxide mixed at about 1 cup per gallon then DS'ed.
Or use a combination of the two.
Then neutralize with oxalic mixed at 1 cup per gallon and DS'ed,..may take a couple applications of neutralizing.
Jeff
-- Edited by Jeff Wible on Thursday 18th of September 2014 07:20:45 AM
Maverick Contracting said
Sep 18, 2014
Jeff normally we would but in this case just going sh route but am doing a sample with percarb. Then it's the cost factor
Doug Shaffer said
Oct 24, 2014
I have a small gazebo to clean. Cedar roof and the rest is untreated cedar or redwood. Where would I purchase sodium percarbonate, sodium hydroxide and oxalic acid?
waxman18324 said
Oct 24, 2014
Check your local chemical (SH)supplier or Univar.
Hank
Art O said
Oct 24, 2014
Been testing with sodium percarbonate, not liking it! But I have some new stuff coming any day. I'm hoping for better results
lkendall said
Oct 24, 2014
sodium percarb. requires pressure to work...
Joshua Williams said
Dec 8, 2014
Most of the people we meet won't even talk to us if we are using high pressure or walking on their roof at all. You are doing high pressure from a ladder?
Hey all, who has used a SH based cedar shake cleaning mix? I have a 5 year old blackened untreated cedar siding job (not roof) that I'm planning on using a 25% ratio mix of 15% SH and surfactant/water. I know the sq/ft'dge of the project. I just need to figure out how much area I can get out of each gallon of mix to crunch my #'s. siding is a diff. calculation than roofing.
thanks Ed, I just dont want to come up short as this is an immense house but were only doing a small part to start that should take an hour or two to do and is remote to my local source. If I have to run out for more SH thats another hour+ lost incl. laborer sitting on his azz.
standard paint/stain coverage per gallon is usually figured as 400 sq/ft but with cedar shake (esp weathered) I get 150 sq/ft of stain so condition and type of substrate varies volume numbers. I know what I get on a asphalt roof but vertical cedar siding of mix Im not sure. In the past we always powerwash'd it.
I will start with an 8:1 mix with extra cling agent
-- Edited by Maverick Contracting on Wednesday 17th of September 2014 11:36:00 PM
If it is raw blackened cedar, I wouldn't even use Sodium Hypochlorite at all. I would use Sodium Percarbonate mixed at about 1 cup per gallon of hot water then apply with a dedicated pump.
Or I'd use Sodium Hydroxide mixed at about 1 cup per gallon then DS'ed.
Or use a combination of the two.
Then neutralize with oxalic mixed at 1 cup per gallon and DS'ed,..may take a couple applications of neutralizing.
Jeff
-- Edited by Jeff Wible on Thursday 18th of September 2014 07:20:45 AM
Hank
I see that you're new to the NSWA. Please take the time to introduce yourself here(www.nationalsoftwashalliance.com/f602060/new-members-introductions/). You might want to re-read the thread.
Hank