[MassHistPres] Historic slate roof repair - tar

[rcsmitharch at verizon.net]

No. nein, nay, non, nyet.  

 

You need a real roofer with appropriate references who knows what slate roofing is about.  If there is an issue with leaks between the exposed slates, they could be repaired with  bibs- copper flashing under joint of the exposed slates that extends up and slips over the top edge of the undercourse slate.  If there are issues in a number of places, though, it could mean that a more extensive repair project is needed.

 

If you can find a copy of the Slate Book (Brian Stearns et al, 1998) it explains correct repair techniques in Chapter 11.

 

Richard Smith

Swampscott Historical Commission

 

From: MassHistPres <masshistpres-bounces at cs.umb.edu> On Behalf Of Sarah White via MassHistPres
Sent: Wednesday, November 1, 2023 8:21 PM
To: masshistpres at cs.umb.edu
Subject: [MassHistPres] Historic slate roof repair - tar

 

Good evening, MassHistPres - 

 

I am looking for information from those with expertise in historic slate roofs. We have an applicant who is proposing to "repair" portions of a slate roof with roof tar - directly applied to cracks in the slate. I have never seen this treatment advised from any standpoint. Please correct me if I am wrong.  The NPS guidance is not particularly helpful.

 

Many thanks in advance.

 

Sarah White, MDS-HP

Senior Planner

Planning, Preservation, & Zoning Division (PPZ)

Se habla español

 

 

 

 

 
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