Announcement

Collapse
No announcement yet.

Leaking Roof

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Leaking Roof

    Hi, finished my oven a few years back and it worked great. Over winter, however, cracks appeared in all the mortar between the stone paving slabs I used to roof it. We get a lot of rain here and it took a while to dry out next year. Fixed that and the same happened, the mortar just breaks up and disintegrates. Any ideas how to fix this for good?

  • #2
    Could you post some photos?
    My 42" build: https://community.fornobravo.com/for...ld-new-zealand
    My oven drawings: My oven drawings - Forno Bravo Forum: The Wood-Fired Oven Community

    Comment


    • #3
      Hi, thanks for taking a look. Hope these will give you some idea. The slabs are bedded in mortar only along the joins so you may see gaps for ventilation, particularly in the corner pic. which is intentional, not fallen away mortar.

      Click image for larger version

Name:	1.jpg
Views:	64
Size:	313.4 KB
ID:	441526 Click image for larger version

Name:	5.jpg
Views:	47
Size:	548.6 KB
ID:	441527 Click image for larger version

Name:	6.jpg
Views:	46
Size:	572.5 KB
ID:	441528 Click image for larger version

Name:	3.jpg
Views:	50
Size:	566.8 KB
ID:	441529


      Comment


      • #4
        When installing masonry on a horizontal surface, it's important to plan ahead for water infiltration. Normally, you'd want to make the joints as small as you can and make sure it's packed in and not too wet, as that just promotes shrinkage of the mortar. Instead, caulking is preferred to minimize this from happening. At this point, it may be best to remove any loose material and caulk it w/a good masonry caulk. Bottom line, is to try to avoid any masonry on a flat surface, as it just invites issues like this. Using a good quality sealer helps, but is not sufficient to do as a stand alone method. You should be able to find a good exterior grade caulking suitable for this. I personally like the Sika products and have had good results w/them. There are others, also.
        My Build:
        http://www.fornobravo.com/forum/f8/s...ina-20363.html

        "Believe that you can and you're halfway there".

        Comment


        • #5
          Originally posted by NCMan View Post
          When installing masonry on a horizontal surface, it's important to plan ahead for water infiltration. Normally, you'd want to make the joints as small as you can and make sure it's packed in and not too wet, as that just promotes shrinkage of the mortar. Instead, caulking is preferred to minimize this from happening. At this point, it may be best to remove any loose material and caulk it w/a good masonry caulk. Bottom line, is to try to avoid any masonry on a flat surface, as it just invites issues like this. Using a good quality sealer helps, but is not sufficient to do as a stand alone method. You should be able to find a good exterior grade caulking suitable for this. I personally like the Sika products and have had good results w/them. There are others, also.
          I came to say the same thing. Could not have put it better myself!
          My 42" build: https://community.fornobravo.com/for...ld-new-zealand
          My oven drawings: My oven drawings - Forno Bravo Forum: The Wood-Fired Oven Community

          Comment


          • #6
            Originally posted by RBH View Post
            Hi, thanks for taking a look. Hope these will give you some idea. The slabs are bedded in mortar only along the joins so you may see gaps for ventilation, particularly in the corner pic. which is intentional, not fallen away mortar.

            Click image for larger version

Name:	1.jpg
Views:	64
Size:	313.4 KB
ID:	441526 Click image for larger version

Name:	5.jpg
Views:	47
Size:	548.6 KB
ID:	441527 Click image for larger version

Name:	6.jpg
Views:	46
Size:	572.5 KB
ID:	441528 Click image for larger version

Name:	3.jpg
Views:	50
Size:	566.8 KB
ID:	441529

            Thanks for posting the photos. As NCMan has said, you need some good quality masonry caulk and yes, Sika makes great products. Ideally, you'd like to pick one that is both waterproof and can handle some movement, as is typical with masonry. You could use a good (again Sika) construction silicone. I would start by removing the mortar, placing backing rod and installing the caulk in the join above the backing rod.
            My 42" build: https://community.fornobravo.com/for...ld-new-zealand
            My oven drawings: My oven drawings - Forno Bravo Forum: The Wood-Fired Oven Community

            Comment


            • #7
              Many thanks for that, I'll give it a try.

              Comment


              • #8
                I found some materials, perhaps someone could confirm they are up to the job. Polyethelene foam backer rod seems straight forward https://www.dortechdirect.co.uk/back...acker-rod.html but there are numerous Sika products. Is Sikaflex EBT+ sealant any good for this?

                Comment


                • #9
                  Originally posted by RBH View Post
                  I found some materials, perhaps someone could confirm they are up to the job. Polyethelene foam backer rod seems straight forward https://www.dortechdirect.co.uk/back...acker-rod.html but there are numerous Sika products. Is Sikaflex EBT+ sealant any good for this?
                  I'd think that would be perfect.
                  My 42" build: https://community.fornobravo.com/for...ld-new-zealand
                  My oven drawings: My oven drawings - Forno Bravo Forum: The Wood-Fired Oven Community

                  Comment


                  • #10
                    Thanks again.

                    Comment


                    • #11
                      You're most welcome.
                      Kind regards,
                      Mark
                      My 42" build: https://community.fornobravo.com/for...ld-new-zealand
                      My oven drawings: My oven drawings - Forno Bravo Forum: The Wood-Fired Oven Community

                      Comment

                      Working...
                      X