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- Case Study: Valleys

- Slate Sources

- Glossary

Case Study: The Valley of Tar

Project:
St. John's Lutheran Church
Richmond, IN

Text by Eric Gockel

This valley has two layers of metal being used, the second was installed on top of the original valley without removing the slates. Then, plastic cement was applied between the edge of the new valley and the valley slates.

The next photo shows a close-up of just what's going on. With the slates removed, you can clearly see that the recent valley installation was merely set on top of the old one with a bead of plastic cement run down the side.

The photo below illustrates how the valley's integrity has been weakened by the previous repair. Note the difference in coverage between the original valley and the repair one. The red dot on the photo marks where a slate is underneath the newer valley. Not a good thing.

After both valleys have been stripped out, a protective underlayment of 55# felt is put in place. Note: this is not a good point to stop for the day! You should always be sure that your projects are watertight before calling it quits. Unless your brother-in-law runs a drywall business...

A new, 16 ounce copper valley is put in place and is fastened with copper clips along the hems of the valley to allow for expansion and contraction and help eliminate buckling.

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