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I have some timber siding (planks of wood) that over lap. I've been told its shiplap but according to the place I got my wood the wood is shiplap but the style of overlaying it is something else.

Anyway, you know what I have, my question is how do I remove a rotten piece that when the house was built had a exterior porch added on later so now most of the wood is inside the house and some of its out side.

I assume that you lift the planks above to remove it but how do I cut out the bad part with out causing further damage?

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A photograph would go a long way here. Short answer is using a sawzall with a piece of sheet metal slid up behind. –  mike Oct 9 '13 at 21:31
    
A sawzall! The one item my father-in-law didn't own. Thanks for the suggestion. –  Lionel Morrison Oct 9 '13 at 21:34
    
For just a few cuts you could block behind the cut with 3/4" stock, then use a skillsaw to cut as much as possible, then take out the blocking and slid in the sheet metal, then finish the cut by hand using a key-hole saw with the blade mounted upside down. –  mike Oct 9 '13 at 21:47
    
A sawzall will go right through the sheet metal, too. ;) I'd consider a small radial saw set to the depth of the siding or an oscillating saw. –  DA01 Oct 9 '13 at 21:48
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@DA01 - Good point. If you are worried that you can't tell through feel or sound the difference between cutting through sheet metal and cutting through wood, use a blade that is designed exclusively for cutting wood. That is, do not use a blade designed to cut through nails. –  mike Oct 9 '13 at 22:30
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