Seal Frame to Masonry, Burnt Sand Mastic, Traditional Materials

Removing & installing sash, temporary boardup, frame & sill repairs, wall sealing, frame & trim painting.
johnleeke
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Seal Frame to Masonry, Burnt Sand Mastic, Traditional Materials

Postby johnleeke » Sun Apr 01, 2018 3:09 pm

Burnt Sand Mastic
(more to come)
Notes:
burnt sand mastic made with sand, linseed oil, lime and newts eyes packed on top of soaked wool roving and saturated hemp or jute oakum, seen it used around 18th & 19th century windows here on coastal Maine, learned more about it from Andy DeGrunchy at the IPTW in Barre, VT.
Tried it out on a couple windows, works just fine, a good alternative to petrol-chemically derived sealants and caulks and more sustainable too.
Shortcut to making your own with a hamburger helper mix:
http://www.limeworks.us/.../SandM.../sa ... tsheet.pdf

Oakum: as found on windows here in Maine, and demonstrated by by Andy at the IPTW, is loosely woven fiber of hemp or jute. Oakum is used in the joint like backer-rod is used with modern sealants.
If you're south of the Mason-Dixon you can take that pile of gunny sacks out in the shed and cut them on the bias into strips instead of buying Oakum. Jest save a few a them gunny sacks sos you can make a pair a breeches in case you run onto hard times.

At 2:06 this video shows oakum use at the sill:

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