Originally Posted By: ccoombs This post was automatically imported from our archived forum.
The ceiling joist can be used as collar ties. I’m not very good with conventionally framed roofs, but I do know that you can use ceiling joist in lieu of collar ties or purlins and kickers.
For your area I wouldn't expect a snow load. I would guess that the roofing is comp. shingles. However, a side note is that comp. roof should have the same loading as a typical tile because you need to assume three layers of roofing material.
The roof rafters and sheathing look new. I would ask if a permit was pulled. I don't see anything wrong with what is there.
Originally Posted By: jlybolt This post was automatically imported from our archived forum.
I agree with Carla.
You would need to look at rafter span tables to determine the max. unsupported distance the rafter can run. Snow load would also influence this. Were not designers, so if you have concerns I would list it as need further evaluation or look at roof plan if available.
Originally Posted By: jnosworthy This post was automatically imported from our archived forum.
Chad,
It looks fine to me. Looks like 2 x 8’s, 24" oc, and about a 14’ to 16’ span. I’m curious about the purpose of the flat 2" x 4" 's catching the seams of the plywood roof deck. There are two reasons in my mind why this may have been done. One, is because its 24" oc and they didn’t have any H–clips for the ply. Two, they bought and installed 3/8" plywood because someone said it would be just as good, but cost less, and then they found out it was a little too “springy”.
Maybe its the photo, but I don’t see any roofing nail points or other nails penetrating this roof deck, other than the occasional 8 penny sheathing nail that missed the mark. What’s this roof covered with ??
Originally Posted By: mcyr This post was automatically imported from our archived forum.
Chad;
From the photos, it looks like the roof was constructed with two x eight's at a 4/12 pitch with a rise of 4' +/- which would dictate a span of 24 to 26'.
These spans would indicate that a knee wall at bare minimum should have been provided or a king post from ridge to a bearing point.
The ridge board appears to be a 2 x 10 and adequate.
It is assumed that since this is of conventional framing, that everything is bearing on load bearing walls. Therefore, the king post and knee wall would have played well with this design for adequate and safe loadings.
Would recommend a competent framing contractor for the area to evaluate.
Originally Posted By: mcyr This post was automatically imported from our archived forum.
Collar ties in a low slope roof such as this one would not be recommended as much as knee walls.
Due to the low slope of the roof system and the dead load applied on it, the angular degree of the collar tie in respect with the rafters would not be as affective as having the knee wall with king post for the ridge or no king post.
The ceiling rafters in any respect will maintain and control the lateral pressures of the roof system on to the wall system.
The collar ties in low slope might not hold the tension applied to them as the compression values increase on the rafter span.
I would recommend an SE to fully advise on the proper procedure to remediate this doubt of adequacy.