Investigate the farmhouse style that s popular in northern new mexico.
Gable roof strawbale.
It uses gable roofs with roof overhangs that would protect the bale walls.
The worst would be tarpaper laid directly against sandwiched between steel and straw.
Then it would make sense to use materials that will not rot.
Well installed shingles will last for generations to come.
Straw bale walls can likely handle small to moderate moisture loads better than conventional wall systems because of the vapour permeable plaster skins on either side and because the straw itself can act as a large reservoir for moisture without ill effects so long as it does not exceed an upper limit and the conditions occur for drying.
Granted it was smaller bale sections and they had rough rendering covering them.
From the top of a stud framed wall which has a similar wooden ledge on top.
I have been party to several straw bale structures that could certainly fit the description of tiny.
With proper roof overhangs humidity is not a problem with strawbale unless you live in a tropical rainforest.
A good time to use this roof is obviously when the budget is tight or if you want a larger exposed side of the structure as in a greenhouse or in cooler climates.
Wood siding gable roof lines tiny front porch you know the look.
I believe the normal thing for strawbale homes is to put a wooden bond beam around the top of the bales tied in with bolts or long staples.
It displaces 612 square feet on the inside and has a radius of 14 inches.
If his design is such that the tops of the bales can be left open porous covering and evaporation can occur through normal roof gable vents will be adequate any method that allows steady slow transpiration of air through the straw column.
By the way we are working one bale at a time here attach the ratchet straps firmly at the base of the wall.
They do so to add a complementary texture to the plaster of the bale walls.
From this wooden ledge you your builder can build almost any roof as you normally would e g.
The following step by step guide will give you the information you need to install shingles properly.
Round 612 square feet straw bale house plan this plan is similar to the octagon plan found further down the linked page.
Firstly you would not use a full bale in the roof and secondly i have previously seen a completed straw bale roof insulation.
For straw bale this can pose a problem in keeping the walls free from direct moisture.
The buildings have charm to be sure yet they tend to carry a similar look for the most part.
A gable roof is probably the most popular and traditional roof.
It would provide a better form of insulation than bats as they are completely sealed and you only have to look at the results of bush fires.