roofing question

Posted by on April 29, 2009, 2:01 pm

I am replacing a cedar shingle roof with a composition roof. The
cedar shingles are nailed to battens. I will need to have a plywood
deck in order to put composition shingles down.

The contractor's I am talking to feel the easiest way would be to put
the plywood down over the exisitng battens. 1/2 " cdx over 7/8 " x 1
3/4 in battens. The battens are 5 1/2 center to center.

I assume that they would nail the cdx into the 2 x 6 rafters which are
16 " oc. and not the battens, but I am not sure about that. They
would use longer nails to make up the greater depth.

Is there a structural strength issue with this approach? Or would it
be better to remove the battens which would be an additional cost.

The net increase depth over existing structure would be handled with
drip edging on the rake and eves.

Thanks in advance, Ron

Posted by jloomis on April 29, 2009, 7:29 pm

Most would go over the battens if they were in good shape. Yes, it is best
to use a longer nail and grab the rafter. Also the battens can be re-naild
or re-screwed. This is common practice. those who have time and money
could remove the battens if so be it. Mostly just for a cleaner neater job.
Flip a coin........
jloomis

>I am replacing a cedar shingle roof with a composition roof. The
> cedar shingles are nailed to battens. I will need to have a plywood
> deck in order to put composition shingles down.
> The contractor's I am talking to feel the easiest way would be to put
> the plywood down over the exisitng battens. 1/2 " cdx over 7/8 " x 1
> 3/4 in battens. The battens are 5 1/2 center to center.
> I assume that they would nail the cdx into the 2 x 6 rafters which are
> 16 " oc. and not the battens, but I am not sure about that. They
> would use longer nails to make up the greater depth.
> Is there a structural strength issue with this approach? Or would it
> be better to remove the battens which would be an additional cost.
> The net increase depth over existing structure would be handled with
> drip edging on the rake and eves.
> Thanks in advance, Ron

Posted by MountainFramer on April 29, 2009, 10:38 pm

> Most would go over the battens if they were in good shape. Yes, it is
> best to use a longer nail and grab the rafter. Also the battens can be
> re-naild or re-screwed. This is common practice. those who have time and
> money could remove the battens if so be it. Mostly just for a cleaner
> neater job.
> Flip a coin........
> jloomis

>>I am replacing a cedar shingle roof with a composition roof. The
>> cedar shingles are nailed to battens. I will need to have a plywood
>> deck in order to put composition shingles down.
>> The contractor's I am talking to feel the easiest way would be to put
>> the plywood down over the exisitng battens. 1/2 " cdx over 7/8 " x 1
>> 3/4 in battens. The battens are 5 1/2 center to center.
>> I assume that they would nail the cdx into the 2 x 6 rafters which are
>> 16 " oc. and not the battens, but I am not sure about that. They
>> would use longer nails to make up the greater depth.
>> Is there a structural strength issue with this approach? Or would it
>> be better to remove the battens which would be an additional cost.
>> The net increase depth over existing structure would be handled with
>> drip edging on the rake and eves.
>> Thanks in advance, Ron

They should be removed.Decking over the battens could cause your roof to
have a wavy look.Also the space between the decking and battens could become
home to rodents and bugs.
Hope that helps.

MountainFramer
Roll Tide.

--
"If you believe in yourself and have dedication and pride - and never quit,
you'll be a winner. The price of victory is high but so are the rewards."
Coach Paul "Bear" Bryant

Posted by RicodJour on April 29, 2009, 11:52 pm

On Apr 29, 2:01=A0pm, joy...@optonline.net wrote:

> I am replacing a cedar shingle roof with a composition roof. =A0The
> cedar shingles are nailed to battens. =A0I will need to have a plywood
> deck in order to put composition shingles down.
> The contractor's I am talking to feel the easiest way would be to put
> the plywood down over the exisitng battens. =A01/2 " cdx over 7/8 " x 1
> 3/4 in battens. =A0The battens are 5 1/2 center to center.
> I assume that they would nail the cdx into the 2 x 6 rafters which are
> 16 " oc. and not the battens, but I am not sure about that. =A0They
> would use longer nails to make up the greater depth.
> Is there a structural strength issue with this approach? =A0Or would it
> be better to remove the battens which would be an additional cost.
> The net increase depth over existing structure would be handled with
> drip edging on the rake and eves.
> Thanks in advance, Ron

Structural issue? How's the structure now with the skip sheathed
roof? You're adding to that, not weakening it.

There's no compelling reason to do it one way versus the other.

R

Posted by Rick Samuel on May 1, 2009, 2:45 am

I'd take metal over composition any day. But it WILL change the look.

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