We can construct a roof using 5 horizontal supports over the 17 foot distance of the open classroom. Most panels to provide the plastic roofing are sold between the lengths of 6 and 12 feet and are typically 26 inches wide. This is the "Suntun" roof variety sold by home depot. By this metric, we would most probably have the least amount of material left over if we used 26 inches by 8 feet piece. This would mean it would take 6 pieces total to cover the extent of the roof in both the length and width.
When we connect the roof pieces to the top of the braces that will line the length of the roof. We can do so by using screws and plastic caps we can find at various hardware supply shops. To connect the wooden braces to the beams that are preexisting, there are various brackets available at local hardware stores. If we need to increase the size of the braces, in terms of their width, this is possible. The current arrangement of the truss structure is just an example of how we can create a roof. There are beams at the point at which the plastic roofing material would overlap and intersect. This way, by having supports in these locations, The roof can become more sturdy. In terms of wood for the actual project, redwood is most probably the best outdoor wood material to use for this sort of construction. The problem is, the wood is incredibly soft and also very expensive.
We can also use pinewood and treat it. Online, there are sources that project getting pine wood treated can make sure it lasts for a longer time. The length of the wood is incredibly long and we can most probably get this custom cut from a local home depot. The cost should not be incredibly high, however, the price may exceed $500. The roof seems to be the number one priority for the creation of the shed and it can be easily accomplished using this truss structure and the corresponding Suntuf roof pieces. Each Suntuf roof piece costs approximately $20 dollars and the screws for them cost around $5 for 50 pieces.There are also Suntuf 24 inch closure strips which allow for the structure of the roof to remain strong. These closure strips would be placed along the parts of the roof were screws could be attached to lock down the structure of the roof. The support beams would be held in place by something such as the steel rafter connectors. These connectors come in a pack of 10 and cost around $100 dollars. This would be needed for the beams
In light of the structural analysis, rafters for the roof will now be spaced two feet apart and will begin at the edge of the vertical members of the classroom. There will be two added knee braces and some ties to help connect the frame of the outdoor classroom to the tool shed. Furthermore there needs to be some sort of accommodation for about two square feet of foundation in total for the classroom. Using the provided load calculations and additional CBC guidelines, this plan for the classroom should be finalized.
After a final consultation with the Structural Engineer, a new plan for the classroom and renewed structural analysis suggests that the current 4x4's in use to support the main structure of the classroom is too weak to support the weight of any proposed roofing. For this reason, it should be replaced by two 4 x 10 x 17 foot Douglas fir treated piece of lumber. Assuming that the foundation of the classroom is sufficient, these wooden pieces should be strong enough to support the weight of 11 2x6's each about 14 feet long to provide overhang for the roof; they will be spread apart by 16 inches and should provide ample structure for polycarbonate roofing.
For most of the connections in the classroom, we will use galvanized iron brackets which are about 3 inches by 4 inches. These will help to provide strength to the ceiling joists and to also attach the 4x10 to the chicken coup. For this reason, there will also need to be the purchasing of additional brackets that help to attach the 4x10 to the columns of the classroom. With these connections in mind and the extensive amounts of lumber needed for the classroom, the price nears $1,000-$1,200. Regardless, this structure of the classroom has been certified to exist as structurally sound from the information provided by the structural engineer.
After additional research into the maximum span of 4 x 10 beams and some additional research, the final plan for the classroom is best reflected in "Roof Plan 7." This, out of all of the proposed plans is the most structurally sound and also the easiest to construct. While earlier plans for the classroom suggested a cost closer to $500, the newer plans account for a lack of structural integrity in the working frame of the classroom. Furthermore, the current classroom must therefore be slightly disassembled to be remade. All of the necessary materials can be mostly found at Home Depot. In the case of some brackets, we will most likely have to purchase these from an online source. The final plan has detailed drawings and sections in place to show the possible roof structure and how it would appear as a finished model with a visual representation of the truss structure without the required overhang.
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