I have found in all my years of building sheds that using pre built trusses is so much easier and simpler then building a shed roof with a ridge board especially if you are building your outdoor shed yourself.
Shed roof extension.
Set 4 by 4 inch posts at each end of the shed and as far out as you want the lean to to extend.
Set center posts if the shed is 8 feet long or two intervening posts if it is longer.
Beyond the standard flat roof or single sloped roof the most common styles of shed roof are gable gambrel skillion and salt box.
Another advantage that metal roofing offers is durability.
Make a dirt floor lean to as the simplest addition to a shed.
Building a shed roof with trusses.
Another method is using tongue and groove planks laid over curved ribs or arches.
A curved shed roof design offers a mix of the flat and gable roof style creating the curve or arch.
A well maintained metal roof system can last anywhere from 30 to 70 years depending on which material is used.
Looking at the existing roof will also give you an idea of timber sizes and how the members are connected.
The easiest to extend would be if the roof is a series of individual trusses at say 16 centres.
Metal roofs have a long life span due to the strength of the material itself.
It typically has a single face that is higher on one end than the other.
Probably one of the simplest shed roof designs out there this style of roof is commonly referred to as a lean to or skillion type of roof.
All of them make a good choice for your garden shed.
The first thing to do is to take a look at the roof of the shed.
A skillion roof is made up of a single flat plane which slopes gradually from top to bottom.
The gable style roof.
A shed roof that is not stick framed will be built with trusses.
Sample of gambrel truss plans.
Metal roofing systems are a great option for many pacific northwest area homes.
Skillion roofs are one of the simplest roof styles used in shed building.
Each of these styles has their advantage both in design and construction.
Saltbox roofs look like skillion roofs but with an extra short slope opposite the long angled plane like an upside down check mark.
What is the roof structure.
It is often used to increase headroom without adding much height.