Roof Sealing and Coating

[Ken1]

Pleas find in the attachment how I resealed and coated the roof of my 86 Chieftain. I would appreciate feedback on my method and whether you think it was cost effective or a wast of money.     http://s901.photobucket.com/user/greenk398/library/Roof%20Repair?sort=2&page=1#/user/greenk398/library/Roof%20Repair?sort=2&page=1&_suid=139078696914406071978077452046

[Stripe]

Looks to me like a job well done. Here is a post where Mark used eternabond tape for the pinholes..


http://www.classicwinnebagos.com/forum/index.php?action=mgallery;sa=album;id=7

[joev]

I used this roof coating to seal my roof on the RV  got it at home depot http://www.homedepot.ca/product/white-knight-flex-coat/901730
http://www.homedepot.com/p/Gardner-4-75-Gal-Sta-Kool-7-Year-Ultra-White-Elastomeric-Roof-Coating-SK-7705/100317815

[Stripe]

Yes, that stuff will do a GREAT job!

[Rickf1985]

Went to Home Depot today to get the Stay Kool and they do not have it. I figured my back up would be the the better of the Henry products and they did not have that either. All they had of the cheaper Henry stuff was one five gallon can with no plans to order any more. I am not waiting for two weeks for them to deliver it to my house!

[DaveVA78Chieftain]

Walmart has been carrying Kool Seal in 1 gal ($20) and 5 gal sizes.

Dave

[Rickf1985]

I saw that today but it appears that that stuff is the cheapest line they have. It is all made by Gibson, I had their site up but closed it. I will get it back and post a link. They have all of their brands listed. Good for comparison between different companies selling thcoatings like Wal-mart, Home Depot, Lowes.
Why can't I post a link on here? Frustrating!! Spell check doesn't work on here either. ARRGH!
www.Garner-Gibson.com
Mouse over the first tab on the left and a drop down will show all the products. Go to elastomeric and you will see all of their brands.
One thing I noticed is that the Kool Seal in Wal-Mart has a SKU trhat will not change over to the factory number so you cannot price check or compare. It is not the siliconized stuff though. Yea, I know, I was calling it the wrong name before. Been a long day on the roof. W%

[DaveVA78Chieftain]

Rick,
I take it you have been doing some research.  I believe most everyone has been using an acrylic based Elastomeric Roof Coating and have no clue there are different versions.  Yes the Kool Seal is acrylic based.  So is the Sta-Kool product joev used in his link above.  Sta-Kool brand also has a acrylic based Elastomeric product, a ceramic based Elastomeric product, as well as a siliconized Elastomeric based product.  If you have a reason for only wanting to use the siliconized Elastomeric based product then it would be benificial to others to understand why you say this.

Dave

[Elandan2]

That website is:      www.gardner-gibson.com   

Rick

[Rickf1985]

Rick, thanks for the correction, I cannot paste links here for some reason. Dave, based on what I have read the siliconized version goes on thicker which means less coats and lasts longer and also is much more flexible. The main reason I am thinking that is because of the stuff that was up there that I am cleaning off. It is pretty stiff in a lot of places. My thought are on mine and are open to comment. It looks like I will be using the cheaper Kool Seal after all since that is all I can find in stock. Home Depot seems to have gone to a new brand that has not been rated and they do not have it in stock. All the stores that have to order it will take two weeks. That would mean cleaning the roof again and I am NOT going to do that again! If this stuff has worked for all of you it will work for me. I plan on selling this RV very soon but I want it to be as good as I can get it so I can honestly say it is water tight and back it up with documentation. I may even try to sell it on here since you all know what has gone into it.

[DaveVA78Chieftain]

Traditional elastomeric/acrylic roof coatings are water-based and cure when water evaporates. When ponding water is present on roof surfaces for a period of 48 hours or more, acrylic roof coatings can begin to re-emulsify to their liquid state and lose adhesion. In contrast, silicone coatings cure and cross-link by reaction with moisture in the air. Silicone cannot re-emulsify due to exposure to standing water.

That is probably the best reason for using the silicon based version.
The also make Urethane based and Polyurea Elastomeric products

http://sprayapplications.com/Roofing/RoofCoatings.aspx

http://wdgsilicones.com/silicone-vs.-acrylic-coatings.html


Dave

PS:  You do know the "Link" button is only available in the advanced Reply mode?  It is not there in the quick reply box at the bottom of a thread page. 

[Rickf1985]

I did not know about the link button, live and learn. What about spell check? When I hit it nothing happens. Thanks for the explanation on the coatings. That told me more than I learned in 5 hours of so called research. i?? Well I am going with the cheap stuff but I have a rounded roof so I should not have an issue with ponding water.  Thanks.

Rick

[DaveVA78Chieftain]

Spell check works in the Quick Reply box.  It does not work in the Advanced Reply box.  Only Mark can solve and/or explain that one.  I usually open a separate window with Google and enter spell xyz, where xyz is your guess at the correct spelling, in the search box.  Google usually knows how to figure what you meant.

Dave

[Rickf1985]

Got up there this morning before the sun got too brutal and cut in around all the stuff up there. It looks like I will need a lot of coats to get a good coating using a brush. I plan to roll the open field with a 3/4 nap roller, hopefully that will cover faster. I can only do this in the mornings before the heat.

[Oz]

5 to 8 coats with a roller, less for the areas you brush since it's going on thicker.


http://www.classicwinnebagos.com/forum/index.php?action=mgallery;sa=album;id=7


Not just a bunch of pictures.  Pictures WITH detailed descriptions.

[Rickf1985]

Well got two coats rolled on today. Note to self, DO THIS IN THE SPRING!!!  Man it is hot up there! I am using a full roller pan plus just a bit more for each coat so five gallons is going to give me five or six coats with no problem. I don't know if I will be able to get that many on but I will try. My biggest obstacle is afternoon thunderstorms. this is NJ, if you don't like the weather just wait 30 minutes, it will change. The last thing I need is to have an entire coat lift off because it rained before the coating was set.

Rick

[Jonbbrew]

Hows this stuff? Seems like a good price if its the right version you are all suggesting?




http://www.homedepot.com/p/Gardner-5-Gal-Sta-Kool-780-Cool-Roof-Elastomeric-Coating-SK-7805/202057691?cm_mmc=Shopping%7cTHD%7cG%7c0%7cG-BASE-PLA-D22-Roofing%7c&gclid=Cj0KEQjwvOC5BRCb_8yNmZ_ls9IBEiQACTz8vhRcFDYkfQGt1o0RihiVJNlSNgryyLGZ6uh9ZySI3p4aAqkA8P8HAQ&gclsrc=aw.ds

[Jonbbrew]

Or this...but i see this is a big upgrade in durability. If price is no option anyone object to this product?Downside?


http://www.lowes.com/pd_354718-29-5532-1-30_0__?productId=3372930&Ntt=trailer+roof+fiber+coatings&pl=1¤tURL=&facetInfo=

[DaveVA78Chieftain]

As long as it is a white silicone based elastomeric coating you should be OK.  I have used the Lowes and Home Depot house versions to good effect.   Kool Seal brand is the higher end version sold at RV stores.

[Jonbbrew]

Great. So just to be clear...surface clean and prep THEN us tape to cover pin holes, around vents etc....Apply coating OVER taped surfaces?




Should you remove all AC, Vents etc before applying tape?

[legomybago]

1) Use Eternabond tape on seams and holes.
2) Use Butyl tape for vent gasket, self level lap sealant over hold down screws.
3) Elastrometric sealant over the entire roof and taped sections
4) Replace gasket under AC unit, does not require any special sealants.

[Jonbbrew]

1) Use Eternabond tape on seams and holes.
2) Use Butyl tape for vent gasket, self level lap sealant over hold down screws.
3) Elastrometric sealant over the entire roof and taped sections
4) Replace gasket under AC unit, does not require any special sealants.

Thank you. So you are saying I need/should pull the AC? Then it's the last to go back in with a new seal (if I can find one)?


So no tape or sealant goes on AC connection with roof?

[legomybago]

You don't "have" to replace the AC gasket, I just thought maybe you wanted to reseal everything up there... Hm?
Any RV store or an on-line website like this  will have a Foam gasket in stock. http://www.pplmotorhomes.com/parts/rv-air-conditioners/rv-roof-ac-gasket.htm  I wouldn't place the new foam AC gasket on top of any roof top sealants you put on, just seal the AC right to the original roof. Snow roof up to it. The gasket has a sticky sides like a sticker. No sealants added.

[Jonbbrew]

You don't "have" to replace the AC gasket, I just thought maybe you wanted to reseal everything up there... Hm?
Any RV store or an on-line website like this  will have a Foam gasket in stock. http://www.pplmotorhomes.com/parts/rv-air-conditioners/rv-roof-ac-gasket.htm  I wouldn't place the new foam AC gasket on top of any roof top sealants you put on, just seal the AC right to the original roof. Snow roof up to it. The gasket has a sticky sides like a sticker. No sealants added.

I appreciate that. I guess I am just scared to break that seal and move that heavy beast. But still want to ensure its sealed when I complete the roof sealing.

[legomybago]

I appreciate that. I guess I am just scared to break that seal and move that heavy beast.

For good measure, take the interior cover off the AC, and locate the 3 or 4 large hold down bolts and make sure they are snug. Over time, the gasket squishes down (settles?) and those bolts need to be tightened up. Every AC I've checked, they were loose.