How to Replace a Rotted Windowsill | This Old House

This Old House general contractor Tom Silva shares some tricks-of-the-trade for installing a new, long-lasting windowsill. (See below for tools and a shopping list.)

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Tools for How to Replace a Window Sill: 

- Oscillating tool [https://amzn.to/2Xf1Tew]

- Reciprocating saw [https://amzn.to/2Wd7R35]

- Flat pry bar [https://amzn.to/2Wj21gZ]

- Hammer [https://amzn.to/2EFmwcR] and 3/4-inch-wide chisel [https://amzn.to/30S4ddE]

- End nippers [https://amzn.to/2wuUv2U]

- Circular saw [https://amzn.to/2XeIsCy]

- Layout square [https://amzn.to/2JM9mPo]

- Drill/driver [https://amzn.to/2Xb40A1]

- Handsaw [https://amzn.to/2Quq5qX]

- Hand plane [https://amzn.to/2WDRzA1]

- Random-orbit sander [https://amzn.to/2QzsFf7]

- Caulk gun [https://amzn.to/2K92x9O]

- Dead-blow mallet [https://amzn.to/2KdSiRQ]

- Pneumatic finishing nailer [https://amzn.to/2KcXdlM]

Shopping list for How to Replace a Window Sill: 

- Spanish cedar [https://amzn.to/2Wema7K], used to make new sill

- 3-inch screws [https://amzn.to/2Kf6euD], for pulling out old sill

- 120-grit sandpaper [https://amzn.to/2MgQU3a]

- Spray primer [https://amzn.to/2K96LhG], for coating new sill

- Silicone caulk [https://amzn.to/2wqGJyx], used to seal new sill into place

- 2-inch finish nails [https://amzn.to/30Qhzaq] for pneumatic nailer

- Minimal-expansion foam [https://amzn.to/2I5sBA6], for filling void below sill

- Exterior-grade paint [https://amzn.to/2WdEygR], to match existing window trim

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