Jump to content
Sign in to follow this  
Mike Lamb

Caulking between Hardie planks

Recommended Posts

Well, hopefully the caulk is not a replacement for the butt flashing behind the siding. Water will get behind siding somehow regardless. Hardie does recommend caulking next to window/door trim etc. So caulking failure is inevitable.  Jerry may be more spot on as far as a cosmetic concern.

IMG_1222.JPG

Share this post


Link to post
Share on other sites

In the early years, it was caulk only,

After a while, ☹️ flashing each joint became the standard for obvious reasons.

With the flashing there, the caulk is not needed, but caulk and paint might be done to hide gaps.

 

Share this post


Link to post
Share on other sites
18 hours ago, Mike Lamb said:

Well, hopefully the caulk is not a replacement for the butt flashing behind the siding. 

For the first 15 years or so, caulk was, indeed, to be used in lieu of flashing. 

A clean, tight butt joint always looks better than a caulked one - even before the caulk failure sets in. 

You do realize that the siding in your picture is not a Hardie product, right?  

Share this post


Link to post
Share on other sites
5 hours ago, Jim Katen said:

For the first 15 years or so, caulk was, indeed, to be used in lieu of flashing. 

A clean, tight butt joint always looks better than a caulked one - even before the caulk failure sets in. 

You do realize that the siding in your picture is not a Hardie product, right?  

I'm pretty sure it is cement board and not LP. I did not think put a knife into it to check. I use Hardie Specs for installation If I think it is cement board. Might this be Certainteed cement board?

Tom might be right. I suppose it could be LP.

Edited by Mike Lamb

Share this post


Link to post
Share on other sites

I agree it looks like LP.

I wonder why it took James Hardie so long to detail the butt joints with flashing? I recall joint flashing being used at each asbestos wall tile joint back in the day. It was usually small tar paper strips.

Share this post


Link to post
Share on other sites

Yup.  Caulking looks like crap after a while and will inevitably leak.  Nothing beats the flashing behind the siding.  It lets the planks, flashing and attaching structure sit tightly together while improving overall ventilation of the siding.  If any moisture finds its way behind the siding, it can evaporate quicker and be evacuated more effectively, minimizing mold and/or rot conditions.  

Share this post


Link to post
Share on other sites
On 2/15/2020 at 4:18 PM, Mike Lamb said:

Well, hopefully the caulk is not a replacement for the butt flashing behind the siding. Water will get behind siding somehow regardless. Hardie does recommend caulking next to window/door trim etc. So caulking failure is inevitable.  Jerry may be more spot on as far as a cosmetic concern.

IMG_1222.JPG

That's LP smart side, not hardiplank. 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...