Cedar clapboard warping


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Old 08-03-16, 01:08 PM
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Cedar clapboard warping

My cedar clapboards are warping due to clapboards working its way out beyond the nail heads. Can renail but the nail heads for this type of siding are small compared to their diameter (9-11 guage nails) , so I guess the same thing will occur. Any advice from those with experience? Thanks in advance
 
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Old 08-03-16, 02:26 PM
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Got a picture?
Rung shanked real siding nails will not pull out if there nailed into something solid.
 
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Old 08-03-16, 03:51 PM
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The nails are stationary. The lower part of the clapboard is moving away from the sheathing (against the nail head) creating a hole the diameter of the head and part or all the way through the half inch clapboard depending on the warp.
 
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Old 08-03-16, 07:45 PM
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If you look at the wall do the nails run in straight lines down the wall...which may indicate that they are nailed into studs? If so replace the nail with a longer nail with a larger head. If not you may be able to locate studs by measuring from a corner of the house or a window. Try and nail into a stud as close to the warp as you can. You can use a nail with a larger gauge too. Use galvanized or stainless nails. Be careful not to split the clapboard. If it a long section that is cupped you can add additional nails along the warp.
 
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Old 08-03-16, 08:38 PM
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So the nails aren't moving and the clapboards are warping so much that they nail heads are pulled into the wood?

My thought is that siding wasn't back primed and/or there is insufficient ventilation behind the siding so the back isn't drying at the same rate as the front.

Probably not much you can do but use larger head nails. You may have to pre-drill so you don't split the clapboards. Stainless steel would be best.
 
 

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