Attic painting question?


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Old 03-26-13, 07:37 AM
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Attic painting question?

Like the title says I need to paint in my attic. The ceiling specifically. I've got some mold up there albeit not much. I plan to fog the entire attic with concrobium which should kill all mold spores etc but afterwards I need to paint out the stains in the plywood.

What kind of paint should I use? I'm going to be using an electric sprayer to do it.



Thanks!
 

Last edited by lawrosa; 03-26-13 at 07:45 AM. Reason: Title edit for clarity.
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Old 03-26-13, 07:50 AM
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Hi, The paint pros should answer shortly. Can you clarify where this plywood is in the attic where you want to paint? Plywood on the rafters?
 
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Old 03-26-13, 08:03 AM
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Hi lawrosa

Yes the its the roof sheathing. I need to paint the bottom side in the attic. Bare wood. Ideally one kind of paint/stain. Not prime then paint.

 
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Old 03-26-13, 09:41 AM
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It's doubtful that any latex paint or primer will seal the stains, also latex coatings are apt to show rust where the roofing nails protrude thru the roof decking. Ideally you'd spray an oil base primer coat and then your choice of top coat.

A dark latex stain should hide the stains and not be too noticeable on any rust but it would make for a dark attic.
 
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Old 03-26-13, 09:46 AM
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Hmm... I am a bit curious of the question at hand.

How will painting the underside of the roof sheathing affect moisture? Moisture retention? Heat of attic? Cold of attic?

Will this cause issues?

Possible there is a ventilation issue at hand if there is mold?
 
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Old 03-26-13, 09:52 AM
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Could I ask exactly WHY you want to paint the underside of the sheathing? Just for esthetics? Is this area used for more than just storage?

Just seems like it will be a real PITA with the work, overspray, and fumes...for a gain of???
 
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Old 03-26-13, 10:01 AM
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I don't know a lot about attics but on exterior repaints when you wash off the mold/mildew, repainting will extend the time it takes for the mildew to come back. Also extra mildewcide can be added to the paint for added protection.

What caused the mold and if that cause has been eliminated is a good question!!
 
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Old 03-27-13, 08:10 AM
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So is a kitchen and bath paint the best choice for this? I've never heard of painting the underside of the roof sheathing before either.
 
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Old 03-27-13, 09:35 AM
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Hi all thanks for the replies. Yes it is for esthetics. I've located the source of the moisture (the roofers left a 5 inch bathroom fan duct in a 4 inch roof stack and didn't even tape it :NO NO NO:

Anyhow I replaced that pipe and taped it all up. Once the mold is killed off I have to make it look pretty. Mostly for resale purposes. I'm not going anywhere for a couple of years but I may as well get it done.

Would an oil based stain do the trick? I know there are a few zeissner mold primers I could sue then put a paint on top but I really don't like going up there so a one coat deal would be much better if possible.

Thanks!
 
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Old 03-27-13, 10:00 AM
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No offense, it's your house and your decision, but if I looked at a house with painted roof sheathing in the attic....I'd wonder what the owner was trying to cover up. If I saw old stains but the wood was sound...wouldn't bother me one bit.
 
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Old 03-27-13, 10:04 AM
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I don't know... my thought would be an oil based primer (I use Zinsser) and then a latex paint (maybe kitchen and bath paint as I mentioned).
 
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Old 03-27-13, 10:14 AM
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Would this work?

Zinsser | Perma-White Semi-Gloss 3.78L | Home Depot Canada

Self priming and low odor I like. There is an exterior version but not low odour which when spraying in an attic would be really nice. Do I need an exterior version for an attic?
 
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Old 03-27-13, 10:26 AM
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As a paint, yes, it would probably be a good choice. However, I don't think it will block stains anywhere near like and oil based primer would.
 
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Old 03-27-13, 10:26 AM
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That's how the local remediation companies deal with mold here. They kill all the mold first then use a mold resistant coating (ie paint) to inhibit further issues and make it pretty.,
 
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Old 03-27-13, 03:23 PM
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You could probably get by with just using an oil base primer and skipping the top coat - it's not like it will get any wear from the elements or human hands...... did I just recommend using primer and not top coating it ??
 
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Old 03-28-13, 05:57 AM
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Eh, he's doing this for looks and I would think the stains, while blocked by the it, would visibly show through the primer. I'm just not seeing a one step way to do this that I think will work.
 

Last edited by stickshift; 03-28-13 at 06:22 AM.
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Old 03-28-13, 06:01 AM
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If the oil primer is sprayed, before you pack up the spray equipment, inspect for any bleed thru and respray those areas - that should give a fairly clean look ...... that's the only way I figure you can get by with 1 coat. Not ideal but after all it is an unfinished attic
 
 

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