A fellow inspector and I looked at a 50+ year old bungalow this morning with a significantly sagging roof (at the ridge and also along the plane of the roof).
If dry verge units are to be fitted to existing buildings all of the old undercloak and mortar bedding should be removed prior to fixing. Dry ridge isn’t always suitable or desirable, especially on some period properties. Choose a ridge board that is one size larger than your common rafters. Take the third board, drizzle it with wood glue on …

I was getting C-Span and the Home Shopping Network on the same station.

Ridge boards shall be at least 1 inch nominal thickness and not less in … Several ridge vent installation tips are given in this video. This Video is taken from AS 1684 The Timber Framing Code If … Cut ends at angles to conform to the slope of the rafters. In new build three or four storey homes (with a top floor which does not 7.5m above ground level), a protected stairway must be created that is continuous to an external door at ground level.
All bracing should be twice nailed with 3.35mm (10 gauge) x 65mm long galvanized round wire nails to every trussed rafter it crosses and to the wallplate. This means that the ridge board for 2x6 rafters, for example, must be more than the nominal 6-inch height of the rafters, because the diagonal cut at the ridge end of the rafter makes the vertical dimension of the face a larger dimension. Roof Framing: collar ties, rafter ties, tension beams & structural ridge beams: some of these can support the roof and prevent ridge sagging and wall spreading. The ridge board runs the length of the building and provides support for the tops of the rafters, helping the whole roof structure work together as a system. A 16-foot board will end at a rafter, with 24-inch spacing.

On inspection of the attic, we found that the ridge board was not continuous. Trussed rafters shall be braced to prevent distortion The roof should be braced using at least 100mm x 25mm timber. Get four nine foot boards an inch thick. There are also some attractive, strictly decorative gable vents available. The Pros And Cons Of Using A Ridge Vent For Your Roof Recently, I wrote an an article that covered everything you need know about roof ridge vents . With a ridge board, you can just nail the ends of the rafters to it. Nail them in place with framing nails. In other words, with continuous joists the size of the center beam might have to go from three 2x10s to three 2x12s, or the lally columns might need to be spaced closer together to support the added load. Learn how to plan a continuous ridge and soffit ventilation system for your attic and how to install soffit vents and other attic venting systems. Continuous ventilation systems with ridge and soffit vents keep attics dry. This has been commented on already.

I think ridge vents in a climate that regularly experiences heavy snow is a … At either end of each four foot length, the rafters (2x4’s) were twinned and bolted together. ... cut drain holes in the ceiling this time to prevent tens of gallons of water from pooling and pulling the blue board off the strapping. The ridge board's length will be the outside measurement of the building plus the length of the overhang, at both ends. The wood screws and clamping plates are available in packs of six.

The ridge of the roof is prepared similarly for both types of ridge vent. Place two of them end to end. Learn more about this technique here. One of the fundamental steps is to nail one side of the ridge vent before nailing the other side. To begin the ridge vent installation, they measure down 3 inches from the top of the ridge and snap a line to cut the opening for the ridge vent.