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Are the gaps in decking boards (PT or composite) *REALLY* necessary?

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Are the gaps in decking boards (PT or composite) *REALLY* necessary? Thomas G. Marshall 04-25-2008
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Posted by Thomas G. Marshall on April 26, 2008, 5:43 am
JIMMIE said something like:
> On Apr 25, 10:43 am, "Thomas G. Marshall"
>> I've spoken to a number of people who have put composite decks in
>> and they followed the manufacturers suggestions carefully and ended
>> up with boards that just "seem" too far apart. A friend of mine has
>> these large gaps around his posts that I'm not particularly fond of.
>>
>> And two of these people say they've never seen the boards expand nor
>> shrink the way the manufacturer warned. I'm not sure of the brands.
>>
>> But this reminds me of something a construction guy told me once
>> about PT (I know, a different issue): "Don't ever listen to the
>> advice about keeping the boards a nail width apart....they will dry
>> and shrink on their own". The only reason I mention this is because
>> I would like to know to what degree such rules of thumb (PT or
>> composite) are real, or just passed along advice that never really
>> applies.
>>
>> For example, has anyone seen trouble with compostite decking boards
>> placed flush (say, in the summer)?
>>
>> Thanks!
>
> Composites are spaced for drainage and yes I have seen them spaced too
> far apart. I think they actually make guage for spacing them now.

It really really detracts from the looks I think when the gaps are large.
You start looking at a porch or a deck as an ordered collection of gaps, and
not boards.



Posted by ransley on April 26, 2008, 8:18 pm
On Apr 25, 9:43=A0am, "Thomas G. Marshall"
> I've spoken to a number of people who have put composite decks in and they=

> followed the manufacturers suggestions carefully and ended up with boards
> that just "seem" too far apart. =A0A friend of mine has these large gaps
> around his posts that I'm not particularly fond of.
>
> And two of these people say they've never seen the boards expand nor shrin=
k
> the way the manufacturer warned. =A0I'm not sure of the brands.
>
> But this reminds me of something a construction guy told me once about PT =
(I
> know, a different issue): "Don't ever listen to the advice about keeping t=
he
> boards a nail width apart....they will dry and shrink on their own". =A0Th=
e
> only reason I mention this is because I would like to know to what degree
> such rules of thumb (PT or composite) are real, or just passed along advic=
e
> that never really applies.
>
> For example, has anyone seen trouble with compostite decking boards placed=

> flush (say, =A0in the summer)?
>
> Thanks!

You need some gap , air venting of moist air. there is expansion, and
for you, dirt and rain removal . Also an ease of cleaning.

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