What is the best way to insulate the exterior walls of older home in Toronto Canada?

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What is the best way to insulate the exterior walls of an older home?

Geoff Kavanagh Published: June 30, 2020, 4:01 p.m.Last updated: Sept. 16, 2020, 8:29 a.m.

I have an older home in Toronto with plaster lathe walls with no insulation behind them.  I want to insulate the walls but not remove the plaster as it's still in excellent condition.  My house goes right to the property line on two sides and the exterior shell is cedar board/insulbrick covered by vinyl siding.  I would like to stip it to the cedar board, putting a wrap over it, but then what would you recommend for insulating after that given my narrow confines?  I really can't extend much more than a couple of inches without encroaching, three max...

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