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Old 05-28-2013, 07:31 PM   #16
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spackle over caulking prevents cracks from recurring?


100% sure. I changed some a year ago due to rot.

they're a bi*** to hammer off the rafters. That's a can of worms right there.

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Old 05-28-2013, 07:59 PM   #17
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spackle over caulking prevents cracks from recurring?


Why dont you just clad it with color matched .032 Aluminum, then you can forget about it.
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Old 05-28-2013, 08:29 PM   #18
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spackle over caulking prevents cracks from recurring?


I have to express my deep love for roofers and siders who think cladding over the top of failing rotting wood is a solution. And OP you expressed there are problems with the roof structure itself too. I will let the roofers jump in and comment and whether you should be thinking of putting on bandaid on that issue.

The two wood restoration products from Abatron are amazing. Step one you carve out all failed wood and use a liquified expoxy to seal what is left. Then you use an expoxy paste to fill everthing in. End product will be more than paintable and stronger than the wood around it.

But again are you sure you want to repair cracking and splitting facia? Not quite sure why it needs to be 2 inches thick, by the way.
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Old 05-28-2013, 10:00 PM   #19
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spackle over caulking prevents cracks from recurring?


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Originally Posted by Matthewt1970 View Post
Are you sure those are 2x8's
Yeah they look like 1x8 and 1x6s to me in the picture
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Old 05-28-2013, 10:14 PM   #20
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spackle over caulking prevents cracks from recurring?


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Originally Posted by Jmayspaint View Post
and he was telling me at my last visit that he has been using spackle and caulk mixed together to make a semi- flexible, semi-sandable, filler for similar things to what your describing. .
Then he must be using a caulk that is the clean up with water type stuff or something because good silicone caulk trying to mix in water based spackle is going to be like trying to mix water with oil.
He may be thrilled now but again, spackle is just cheap soft interior patching compound, it was never meant to be used outdoors or in the weather.

Here's what is in Dap spackling compound, it's water based and is basically ground up calcium carbonate-- like plaster which itself is also not an exterior material:


ChemicalCAS No / Unique IDPercent Ethylene glycol000107-21-10.1-1 Calcium carbonate (Limestone)001317-65-360-100 Water007732-18-5
Mica012001-26-20.5-1.5 Attapulgite012174-11-70.1-1 Quartz014808-60-70.1-1
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Old 05-28-2013, 10:27 PM   #21
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spackle over caulking prevents cracks from recurring?


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Originally Posted by pman6 View Post
don't knock it till you try it.

I will try a small area with caulk and joint compound mix

I do knock it and refuse to try it because as a sculptor I have had years of experience with all kinds of plasters, gypsum products and concrete, I also know when you use an interior only product outside in the rain it will decay rapidly, in fact I have several sculptures made from USG hydrocal gypsum cement sitting outside as tests and they have been slowly disolving like sugar cubes do.

I have this photo handy of a plaster corbel left out in the rain in the garden, you can see what happens, no matetr how much paint you apply the plaster absobs water, the paint comes off, the material starts disolving, spackle would be even worse:




Quote:
If I only need paintable silicone caulk, then DAP Alex Plus meets that criteria, and it's only ~$2 a tube. The general acrylic painters caulk is 50 cents cheaper.
There's where people get into trouble, they think in terms of what is the CHEAPEST stuff to use, you are talking about <$20 in costs here for caulk and you want to save 50 cents a tube or $2 a tube going with the CHEAPER stuff?
Don't go with CHEAP caulk unless you want to redo it again in a year or two, cheap caulk is cheap for a reason- it's garbage.
It doesn't matter if the caulk is $15 a tube to get the GOOD stuff, chances are you wont need more than a couple of tubes at most for what I see in the pic anyway.
Do it right the first time with quality materials, or mark my word you'll be redoing it all over again in short order.
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Old 05-28-2013, 10:38 PM   #22
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spackle over caulking prevents cracks from recurring?


oh, I'm not buying the cheap stuff.
I have the premium DAP Ultra 230 ordered.
I'm not doing this over again.


It's interesting that the datasheets for these caulks advise against using them for surface defects like these wood cracks.

But a product like dupont elastomeric patch can be used for surface defects.....

http://www2.dupont.com/Caulk/en_US/a...ric_patch.html


I also found another elastomeric patch made by custom building products
http://www.homedepot.com/p/Phenopatc...9#.UaV28LU3uHc

Quote:
Permanently get rid of recurring cracks with this high-performance Phenopatch 10.1 oz. Elastomeric Custom Patch. It offers a durable, flexible fill to resist cracking, crumbling or falling out.

Eliminates recurring cracks in brick, plaster and wood by providing a permanently flexible fill
says it's permanently flexible. It sounds exactly like the caulking/spackle mix discussed a few posts back.
It goes on like caulk, but it's sandable.

Last edited by pman6; 05-28-2013 at 10:43 PM.
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Old 05-28-2013, 11:07 PM   #23
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spackle over caulking prevents cracks from recurring?


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Here's what is in Dap spackling compound, it's water based and is basically ground up calcium carbonate-- like plaster which itself is also not an exterior material:
Careful. But you grabbed the jest of it all. Interior caulks and spackle will fail on exterior surfaces.

Those of us who have mixed plaster for interior and exterior surfaces. Will stand by them inside or outside. Baking soda patching plaster? Nobody resonsible uses that stuff inside or out.

Last edited by user1007; 05-28-2013 at 11:15 PM.
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Old 11-17-2013, 09:30 AM   #24
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spackle over caulking prevents cracks from recurring?


Why dont you crazy people call the manufacturer and ask what to use? Dap has a whole line of exterior products and their "doctors" are chemistry Phds. I am painting a cracked fascia just like that one and am skimming an exterior Dap product called crack shot over he badly cracked areas and trying to remove the excess so only the crack is filled--so it is not a skim coat. I am using Valspar Duramax paint which claims to bridge fine cracks. My third house with Duramax but first time to spackle fascia. I didnt use the lastomeric spackle becuse I dont want the substrate to be more flexible than the paint, although I believe Duramax has elastomeric properties. I am sure it will work okay but I want 15 years out of this job. I also chose a lighter fascia color because the sun on the dark fascia is probably part of the problem. 35 year old house with original fascia.
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Old 11-17-2013, 07:20 PM   #25
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spackle over caulking prevents cracks from recurring?


big strech
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Old 01-01-2014, 06:52 PM   #26
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spackle over caulking prevents cracks from recurring?


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Originally Posted by pman6 View Post
http://www.contractortalk.com/f8/spa...er-caulk-8589/


Just found that on google.

I have dry, cracked fascia board, and I'm wondering whether anyone else has used this spackle over caulk trick to prevent cracks from coming back.

I don't understand the theory behind why this works. Caulk by itself will crack. Spackle by itself will crack. But spackle over caulk won't crack, according to these guys.


I realize this is a very old post and your problem has likely been solved one way or another.
But I thought I'd toss this in here for reference.
Ever hear of Zinsser Ready Patch Spackling and Patching Compound?
Pretty good stuff and I use it a lot. Sandable and paintable, interior or exterior, cures hard. I had a similar problem with the fascia on this place along with having a million nail holes to patch after removing various old layers of siding over original clapboard on this city owned project wanted done.(well, not a million but it took 3 guys 2 days to patch them all, there were a whole lot of holes, 2 story 4 apartment with a store in the front)
This is a yuppy type neighborhood with a lot of strange looking houses, this one was dark brown with hot purple trim.
Why they picked this green color I will never understand, but hey, do you!
HomeDepot carries it and it's cheap enough. After 3 years this place is still looking great. And no blemishes or shrinkage from the Ready Patch.

Last edited by HighGlossPL38; 01-03-2014 at 09:31 AM.
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Old 01-02-2014, 11:30 AM   #27
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spackle over caulking prevents cracks from recurring?


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You dont want to put spackle outside anyway, it's an interior product, caulk will not crack if you use the good stuff, the $1.99 a tube stuff is garbage.
Bingo
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Old 01-02-2014, 11:37 AM   #28
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spackle over caulking prevents cracks from recurring?


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so we're talking about Dap Dynaflex stuff?

That Dap Alex Plus (with silicone) is crap too, right?
DAP Dynaflex is not crap, and it's not $1.99 a tube. However it's the minimum I'd use exterior. Alex Plus is below the minimum. Alex Ultra 230 is the same as Dynaflex 230, but it has mold inhibitors. If I thought it would actually get rained on, I'd use a polyurethane caulk.
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Old 01-02-2014, 11:43 AM   #29
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spackle over caulking prevents cracks from recurring?


2x fascia would be unusual. The Abatron epoxy is excellent stuff and has saved the day more than once for me.

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