Guest,

I cannot picture the roof in your question. Can you make a simple sketch to show the lines of the existing ridges, hips, and valleys; as well as the proposed addition?

--JMM

Best: Solution one with the ridge continuing to both hip peaks (no blind valleys) OK: Second solution with a large cricket to drain the water. Flat areas are future problems, keep everything sloping

Do you mean like this:-

Or like this:-

Sorry I just downloaded sketchup to do these drawings and it seems to have rendered different surfaces in different ways.

The first way you will need very substantial waterproofing on the gable ends, to avoid water seeping through the walls.

The second way should be OK, as long as you don't get too much snow.

In the land of OZ, at least in the state of New South Wales, we try to avoid having two roofs drain into a common gutter. We call this a box gutter. It tends to accumulate dead leaves and other flammable material. This is usually removed when the wildfire comes to visit.

I am not sure if your proposed extension is in a part of California that is prone to fire but if you are this may be worth considering.

Here is the link to the book that is called up in our legislation:

http://www.rfs.nsw.gov.au/file_system/attachments/State08/Attachment_20070301_0A17F845.pdf

Page 42 of the document deals with roof profiles and their desirability in Bush Fire Prone areas.

If you would like any additional information just let me know. I am just about sick of bar-b-qued families.

BAB

There a few different scenarios from the way you described it. In some of these you will not need a cricket. Crickets are used to change run off or deter snow loads. Being in Caliornia you only need worry about the former. You have probably seen many crickets and just did not realize it. Done properly you are not supposed notice them unless you are specifically looking for them. If you are using terra cotta tile I am sure the roofer would be happy if you do not. A drawing would help.

Chris

clk13_2@hotmail.com

Chem E. and retired carpenter