Why not flat (sloped) steel trusses holding up ICF deck for roofs and floors, the trusses go one way and the steel beams in the ICF go perpendicular to hold the forms and the concrete beams span between the steel trusses, the ICF gives you the insulation above the trusses while the trusses give you the building HVAC, plumbing and electrical run area. With Amdeck you might be able to get away without any ICF supports below it by placing the trusses so they were the supports during the pour for the cement beams.
Thanks for your comment! Using flat/sloped steel trusses in combination with ICF (Insulated Concrete Form) decks is indeed an innovative approach, especially for applications where you need integrated insulation and a clean area for HVAC, plumbing, and electrical runs. Systems like Amdeck can offer great versatility by acting as both the form and insulation layer for concrete roofs or floors. That said, this method is often seen in commercial or specialized residential projects, where factors like higher budgets and specific design needs justify the complexity. For pole barns or similar structures, traditional wood or steel trusses tend to be more cost-effective and easier to install. They’re also highly customizable to meet snow and wind load requirements.
8ft spacing seems too far for 2x4 purlins based on all the span tables I've seen. Does the structural steel roofing allow you to have longer purlin spans?
Great question! The 8' spacing works because the structural steel roofing adds strength and stability, allowing for longer purlin spans compared to traditional setups. However, it’s always important to follow engineering specifications tailored to your specific building design and loads.
In Michigan, building codes for truss spacing are generally dictated by the Michigan Residential Code (MRC), which is based on the International Residential Code (IRC). The code requirements for truss spacing at 4-foot and 8-foot centers primarily depend on several factors, including the type of structure (residential, agricultural, etc.), roof loads, snow loads, and the span of the trusses. For a specific project, it's essential to consult with a structural engineer or the local building authority to ensure that the truss spacing meets the required building codes. Additionally, reviewing the truss manufacturer's guidelines and any engineering specifications is crucial to ensure compliance.
Thank you for your question about truss installation and joist hangers. Installing trusses 10 feet on center with drop in purlins is feasible, but we have found that 8’ on center with purlins attached continuously above the trusses is more cost effective. Using 2x6 joist hangers spaced 24 inches on center with 2x6 purlins can work, but since they are not interconnected from bay to bay (across the trusses), you lose significant diaphragm strength in your roof resulting in additional costs to add strength back into your roof system by other means. Before proceeding with the installation, I recommend consulting with a structural engineer or building inspector to ensure that your design meets safety standards and structural requirements for your specific project.
Thank you for sharing your preference! Setting trusses 4 feet on center is indeed a common approach in certain applications, especially when considering blown-in insulation for ceilings. At FBi Buildings, we choose to set our trusses 8 feet on center to maximize structural efficiency, provide flexibility for various insulation methods, and optimize cost-effectiveness without compromising strength or durability. That said, we understand that every project has unique needs. Thanks for engaging with our content, and we appreciate your perspective!
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Why not flat (sloped) steel trusses holding up ICF deck for roofs and floors, the trusses go one way and the steel beams in the ICF go perpendicular to hold the forms and the concrete beams span between the steel trusses, the ICF gives you the insulation above the trusses while the trusses give you the building HVAC, plumbing and electrical run area. With Amdeck you might be able to get away without any ICF supports below it by placing the trusses so they were the supports during the pour for the cement beams.
Thanks for your comment! Using flat/sloped steel trusses in combination with ICF (Insulated Concrete Form) decks is indeed an innovative approach, especially for applications where you need integrated insulation and a clean area for HVAC, plumbing, and electrical runs. Systems like Amdeck can offer great versatility by acting as both the form and insulation layer for concrete roofs or floors.
That said, this method is often seen in commercial or specialized residential projects, where factors like higher budgets and specific design needs justify the complexity. For pole barns or similar structures, traditional wood or steel trusses tend to be more cost-effective and easier to install. They’re also highly customizable to meet snow and wind load requirements.
8ft spacing seems too far for 2x4 purlins based on all the span tables I've seen. Does the structural steel roofing allow you to have longer purlin spans?
Great question! The 8' spacing works because the structural steel roofing adds strength and stability, allowing for longer purlin spans compared to traditional setups. However, it’s always important to follow engineering specifications tailored to your specific building design and loads.
Is that code in Michigan? Thanks 😊
In Michigan, building codes for truss spacing are generally dictated by the Michigan Residential Code (MRC), which is based on the International Residential Code (IRC). The code requirements for truss spacing at 4-foot and 8-foot centers primarily depend on several factors, including the type of structure (residential, agricultural, etc.), roof loads, snow loads, and the span of the trusses.
For a specific project, it's essential to consult with a structural engineer or the local building authority to ensure that the truss spacing meets the required building codes. Additionally, reviewing the truss manufacturer's guidelines and any engineering specifications is crucial to ensure compliance.
what about ten foot on center ?
2x6 joist hangers 24 on center with 2x6 purlins
Thank you for your question about truss installation and joist hangers. Installing trusses 10 feet on center with drop in purlins is feasible, but we have found that 8’ on center with purlins attached continuously above the trusses is more cost effective.
Using 2x6 joist hangers spaced 24 inches on center with 2x6 purlins can work, but since they are not interconnected from bay to bay (across the trusses), you lose significant diaphragm strength in your roof resulting in additional costs to add strength back into your roof system by other means.
Before proceeding with the installation, I recommend consulting with a structural engineer or building inspector to ensure that your design meets safety standards and structural requirements for your specific project.
think I would prefer 4ft for a ceiling and blown insulation
Thank you for sharing your preference! Setting trusses 4 feet on center is indeed a common approach in certain applications, especially when considering blown-in insulation for ceilings. At FBi Buildings, we choose to set our trusses 8 feet on center to maximize structural efficiency, provide flexibility for various insulation methods, and optimize cost-effectiveness without compromising strength or durability.
That said, we understand that every project has unique needs. Thanks for engaging with our content, and we appreciate your perspective!