The Greenstone Home Reference mark: a square quarry tile carrying the letters G R.

Greenstone Home Reference

Working notes on repairing, insulating and upgrading older masonry houses.

Plumbing & Water

Knowing what you can isolate, and what changes when you reduce flow at the fixture rather than at the main.

Schematic of a water riser with branch lines to three floors, showing the main stop, floor isolators and individual fixture stops.
Three levels of isolation: the main stop, a floor isolator where one exists, and the fixture stop under each outlet.

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