| Author | Message | ||
     Old_school (Old_school) Senior Member Username: Old_school Post Number: 947 Registered: 01-2009 |
Dennis, good to hear from you. If you use the 20 oz. it will last longer. Longer than we will be alive anyway. Did you decide to join us? John | ||
| Joe (Joe) Moderator Username: Joe Post Number: 758 Registered: 07-2006 |
That's how we do it (as the photo shows). We use 16" X 16" 20 ounce copper, turned as shown. Have done it for decades like that. Learned the technique from removing and replacing old closed valley flashings. Eventually it will get pitted and leak. | ||
| Dennis_m_crookshanks (Dennis_m_crookshanks) New member Username: Dennis_m_crookshanks Post Number: 6 Registered: 09-2009 |
You don't get much valley coverage installing the flashing like that. Better to turn the squares parallel to the valley line, or better yet, use a chevron pattern to match the slate line. Should not be a problem with that steep of pitch though. | ||
| Old_school (Old_school) Senior Member Username: Old_school Post Number: 946 Registered: 01-2009 |
Perfect! Very well done. I hope it makes sense now! | ||
| Spp (Spp) Member Username: Spp Post Number: 21 Registered: 09-2008 |
As a follow up -- I forgot I had taken this:  | ||
| Spp (Spp) Junior Member Username: Spp Post Number: 20 Registered: 09-2008 |
Thanks for the explanation. I could be off on the size of the copper squares -- it was a guesstimate. Yes, they were installed one course at a time along with the slate on both sides (I didn't do the work -- I'm just the guy who pays to have it done).  Thanks again for the reply. I have been meaning to ask about this for a while now and kept forgetting. | ||
| Old_school (Old_school) Senior Member Username: Old_school Post Number: 921 Registered: 01-2009 |
SPP Normally they would be larger than that, maybe 16 inches square. They are inserted while you ar going up the valley and you do both sides at once. You could call it a "step valley" similar to the step flashings that you install as you go up a vertical wall. The "reason" you do it this way is because the water will shed off the metal and onto the slate below, and never have a chance to run sideways and get beneath the valley metal. The water never has a chance to "buildup' before it is out of the slates and onto the surface. DON'T jamb the slates tight together in the valley or against the wall when using step flashings. Let the space (maybe 1/4 to 1/2 an inch) allow the water to flow away without damming up. | ||
| Spp (Spp) Junior Member Username: Spp Post Number: 19 Registered: 09-2008 |
Is there a difference on how a closed valley is flashed versus an open one? Most open/exposed valleys that I see use a single sheet of metal with the slate covering the outer few inches of the metal. When we had a closed valley reflashed recently it was done using small (say 6-8") overlapping squares of copper laid on top of one another along the valley and then slated over. Is there a reason for using this technique in the closed valley as opposed to the single long sheet of copper that I normally see? |
