Vinyl siding install

stagger19 · 07-25-2006, 08:31 PM

Hi, I just finished building a 16 x 24 garage, and since my shed has seen much better days, and I was still the building mode, I tore the shed down and built an 8 x 12 shed for my lawn and garden tools.

Anyways, I have the roof shingles on, the buildings tyvek right now, and I hear you should install flashing down the corners before u install the vinyl corner post.

Is that really needed since I put Tyvek housewrap around the whole outside?

Thanks in Advance...

Bonus · 07-26-2006, 12:39 AM

That's a new one on me. I don't install the stuff for a living but I've certainly repaired/replaced/added to it often enough, and I've never seen that.

**AtlanticWBConst.** · 07-26-2006, 06:41 AM

Agreed with Bonus,

Never heard of, never installed, never seen installed ....such a thing as corner flashing....like what is described. It also doesn't make sense for flashing to be in that area, as there is no chance for water or even ice build up in that location.

stagger19 · 07-26-2006, 12:41 PM

I thought that was kinda odd also, but while reading the owens Corning .pdf file on siding installion, this is what they list.....

Outside and Inside Corner Posts

■

A water resistant material should
used to flash the inside and outside
corners a minimum of 10"
on each side before installation
of the corner posts (Fig. 27).

**AtlanticWBConst.** · 07-27-2006, 10:08 AM

You know what?.....The only area where I could see this application would be on a 2nd floor outside or inside corner that drops onto a roof pitch area....where snow/ice can build up.

If you want to apply that flashing...you could, it's not real expensive. It is a level of moisture overkill...I just don't see the practicality of it.

-2 cents-

rayh78 · 08-02-2006, 07:17 PM

Quote:

Originally Posted by stagger19

I thought that was kinda odd also, but while reading the owens Corning .pdf file on siding installion, this is what they list.....

Outside and Inside Corner Posts

■

A water resistant material should
used to flash the inside and outside
corners a minimum of 10"
on each side before installation
of the corner posts (Fig. 27).

They are not talking about metal flashing here. Your Tyvex or tar paper would be the water resistant material used to flash. And of course better to wrap the whole building and not just the corners. I have seen a few where they just nailed to the OSB which is a bad idea.

manhattan42 · 08-02-2006, 08:02 PM

Quote:

"They are not talking about metal flashing here. Your Tyvex or tar paper would be the water resistant material used to flash. And of course better to wrap the whole building and not just the corners. I have seen a few where they just nailed to the OSB which is a bad idea."

Although this is probably splitting hairs for a shed, neither 'tar paper' not 'housewrap' is considered flashing under any building code.

In fact, housewraps like Tyvek only qualify as 'air barriers' in most cases...and not 'moisture barriers'.

That said, I would go with the manufacturer's installation instructions, which is going to determine your warranty, and install true flashing like aluminum under the outside vinyl siding corners.

Otherwise you can find yourself SOL if you have a problem.

The few extra bucks spent is well worth the additional peace of mind.