Spar to wall adhesive technique

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Re: Spar to wall adhesive technique

Postby tony.latham » Tue Jan 06, 2015 12:47 am

Diemjoe wrote:I am going with a Grumman 2 profile. To profile is mostly curve but spars have at least 1" flat surface to connect to. I am hoping to not have visible nails. Is there anything special I would need to do (shaping the spar) in order to get full contact or is adhesive thick enough to cover the gap? I am planning a wood roof so am wondering if square to curve may cause some ripples in the look?

Thanks


The only thing I use nails for anymore is to pop the seal on another tube of adhesive. (I use either screws or 1/4" crown staples)

You will not have ripples showing through. I'd recommend a good polyurethane glue such as PL Premium that has good gap-filling properties. Doing it without some type of fastener? You're getting outside my experience curve but don't worry about ripples with 1/8" ply.

T
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Re: Spar to wall adhesive technique

Postby halfdome, Danny » Tue Jan 06, 2015 11:36 pm

I just glue with Titebond II and a couple screws through the walls to the end grain of the spars.
The glued and stapled roof sheathing marries the walls and spars together to make a nice strong joint.
I use two layers of 1/8" Baltic Birch plywood to make a really solid roof.
The second course of 1/8" is installed from the opposite end with full glue coverage & to span the joints of the first course.
Never had any issues.
:D Danny
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Re: Spar to wall adhesive technique

Postby dales133 » Tue Jan 06, 2015 11:54 pm

halfdome, Danny wrote:I just glue with Titebond II and a couple screws through the walls to the end grain of the spars.
The glued and stapled roof sheathing marries the walls and spars together to make a nice strong joint.
I use two layers of 1/8" Baltic Birch plywood to make a really solid roof.
The second course of 1/8" is installed from the opposite end with full glue coverage & to span the joints of the first course.
Never had any issues.
:D Danny

What do you glue the roof sheets together with?
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Re: Spar to wall adhesive technique

Postby halfdome, Danny » Wed Jan 07, 2015 12:52 am

dales133 wrote:What do you glue the roof sheets together with?

The same Titebond II.
I skin over it with .040 anodized aluminum that's glued on with contact cement.
:D Danny
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Re: Spar to wall adhesive technique

Postby dales133 » Wed Jan 07, 2015 3:29 am

Cool thanks for the reply
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Re: Spar to wall adhesive technique

Postby KCStudly » Wed Jan 07, 2015 11:16 am

Danny, do you infill between the spars to form a ledger for fastening the roof skins (essentially "spar filler" corner blocking to staple the roof skin to, rather than going into the edge grain of the wall)?

This "spar filler" technique adds a great deal of strength and aids in the connection of the spar to wall when fit tight and glued solidly.
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Re: Spar to wall adhesive technique

Postby halfdome, Danny » Wed Jan 07, 2015 2:05 pm

KCStudly wrote:Danny, do you infill between the spars to form a ledger for fastening the roof skins (essentially "spar filler" corner blocking to staple the roof skin to, rather than going into the edge grain of the wall)?

This "spar filler" technique adds a great deal of strength and aids in the connection of the spar to wall when fit tight and glued solidly.

Yes, I always add 3/4" to 1 1/2" blocking between spars depending on what's available/handy.
I come back with a straight top bearing router bit to flush them up with the walls.
I use a 3/16" crown x 5/8" staple and staple both the wall and the blocking when installing the roof skins.
I have a 1/4" deep continuous 1 5/8" wide rabbet from one end of the wall to the other end for the ceiling to attach to before I install the spars.
This allows for 3 layers of 1/2" foam insulation before the roof skins go on.
This rabbet leaves me with a 1/2" thick wall at that point so blocking is essential.
I need the extra thickness that the blocking gives for the screws that attach the RV insert molding over the aluminum skins.
I was doing this blocking procedure just the other day.
:D Danny
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Re: Spar to wall adhesive technique

Postby ajliquidation » Thu Jan 22, 2015 5:46 pm

Danny do you have any pictures of this? I think I understand what all you guys are saying but some pics would really help. Sorry I'm needy! Thanks Adam in KC
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Re: Spar to wall adhesive technique

Postby halfdome, Danny » Thu Jan 22, 2015 9:50 pm

ajliquidation wrote:Danny do you have any pictures of this? I think I understand what all you guys are saying but some pics would really help. Sorry I'm needy! Thanks Adam in KC

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Here you go.
The blocking is what's being clamped.
The screws you see in the spars are going through the ceiling and into my headboard shelf and dividers.
Marries everything together to make a very strong box.
:D Danny
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Re: Spar to wall adhesive technique

Postby ajliquidation » Sun Jan 25, 2015 10:33 pm

Thank you! Makes total sense now!
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