Recently put an addition on and the roof and slowly gotten a lumpy, sunken look. Has anyone ever seen something similar? what is typically the cause? OSB was used for the decking, nails and clips.
Please help!
j(//)
Not sure whether you posted a photo or not but it is not appearing in the message. OSB get wet prior to your underlayment? Did you use 30# felt or synthetic underlayment? Did you meet the sheets on a rafter or between a rafter? Was you underlayment flat when you applied your singles? What weight shingles did you use? Did you use 5/8" or 1/2" OSB sheeting or plywood? Were your rafters set on 16" or 24" OC. Did you use factory made rafters or did you make them up yourself. All or a combination can contribute to what you describe.
What John said. A photo would be worth a 1000 words. :)
help with posting photos....HERE (http://countryplans.com/smf/index.php?topic=11663.0)