The only real risk is that the roof won't get hot enough to seal the shingles. It looks like you have one roof that runs east-west and the other runs north-south. The north-south roof will probably get enough sun to melt the glue strip, but I'd be a bit concerned about the north side of the east-west roof. If you're in doubt, the roofers can put a bit of roofing cement under each shingle, something they will no doubt be loathe to do. But check the instructions for the particular brand of shingles, because most require "hand sealing" with roofing cement on steep roofs, anyway. Here's what I found in the GAF Timberline instructions:
WIND RESISTANCE/HAND SEALING: These shingles have a special thermal sealant that firmly bonds the shingles together after application when exposed to sun and warm temperatures. Shingles installed in fall or winter may not seal until the following spring. If shingles are damaged by winds before sealing or are not exposed to adequate surface temperatures, or if the self-sealant gets dirty, the shingles may never seal. Failure to seal under these circumstances results from the nature of self-sealing shingles, and is not a manufacturing defect. If shingles are to be applied during PROLONGED COLD periods or in areas where airborne dust or sand can be expected before sealing occurs, the shingles MUST be hand sealed. See Nailing Instructions / Hand Sealing.
MANSARD AND STEEP SLOPE APPLICATIONS: For roof slopes greater than 21" per foot (1750mm/m), shingle must be hand sealed. DO NOT use on vertical side walls.
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Today's Featured Article - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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