Frequently Asked Questions about construction of Deltec Homes

We field dozens of questions from homeowners and their building team. Here are some questions and answers we frequently receive.

1. What type of foundation can I use?
2. How do I lay out the foundation?
3. Where does the foundation stop and the Deltec system begin?
4. How are the radial floor trusses installed?
5. What hardware is included for the floor system and what do I need to provide?
6. How do I cut all the plywood to fit? What does Deltec provide?
7. The customer plans to carry heavy loads like a large library, a rock collection, hydronic radiant floor heat, thick ceramic tile flooring, etc. Can the floor trusses carry that additional weight?
8. What type of equipment do I need? How heavy are the panels?
9. How is the building tied down to the foundation? Discuss how this is different for different foundation types.
10. How are the wall panels connected together?
11. How do I install the windows?
12. How do I install wood, HardiePlank, or vinyl siding on the wall panels?
13. How straightforward is it to lay out the roof trusses?
14. How are the roof trusses supported and connected?
15. How do I assemble the self-supporting roof system?
16. The snow load in our area is high. Can the Deltec roof handle the load?
17. What roof hardware is provided and what do I need to provide?
18. Do I need to cut each piece of roof sheathing to fit?
19. When can I remove the erection jig? What do I do with the erection jig when I’m done with it?
20. Does Deltec provide roof underlayment?
21. Does Deltec provide shingles for the roof?
22. What is included in the high wind/seismic package? What are the benefits of that package?
23. How do I install the interior walls so that they are not load bearing?
24. Where do I locate the mechanical, electrical, and plumbing systems and ductwork?
25. Is there anything unique about finishing a Deltec after it is dried in?
26. What further construction guidance and advice is available?
27. Are there any special requirements for inspecting a Deltec building?
28. What does the Deltec package include?
29. What should I know about the construction of a garage?
30. My building department jurisdiction requires plans to be sealed by a structural engineer. Are structural engineering seals available for the structure and the foundation?

Foundation

1. What type of foundation can I use?

Deltecs can be built on any type of foundation. Common foundations include slabs, elevated slabs, piles, crawlspaces, and basements.

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Foundation - Benchmark/Layout

2. How do I lay out the foundation?

Deltec provides a benchmark that serves as the building’s center. Dimensions are provided from the benchmark center to the edges of the foundation at the corners, as well as indicating the angle between the panel corners.

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Sill Plate

3. Where does the foundation stop and the Deltec system begin?

The Deltec package covers everything structural above the sill plate. The contractor or owner provides the foundation system and sill plate, on which the Deltec floor system rests. For buildings on slab, a pressure-treated sill plate is built into the Deltec wall panels, and no additional sill plate is required.

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Floor System - Trusses

4. How are radial trusses installed?

Floor trusses are installed in order around the circle, meeting at the center around the benchmark location and spaced at 2 ft. on center at the outside ends. Ribbon boards are applied at the top and bottom chord locations along the exterior end to ensure stability of the trusses.

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Floor System - Hardware

5. What hardware is included for the floor system and what do I need to provide?

Deltec provides all required hardware for the floor system, including truss ties and truss bridging, with the exception of nails for the floor sheathing. Deltec provides information about the nail size and type and the contractor then purchases nails that work with the specific nail guns to be used.

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Floor System - Sheathing

6. How do I cut all the plywood to fit? What does Deltec provide?

The lower layer of floor sheathing is provided by Deltec and precut to follow the angle of the trusses. The upper layer of sheathing is provided by the contractor and is laid in full sheets after the installation of the exterior wall panels but prior to construction of the interior walls.

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Floor System - Special Loads

7. The customer plans to carry heavy loads like a large library, a rock collection, hydronic radiant floor heat, thick ceramic tile flooring, etc. Can the floor trusses carry that additional weight?

When large loads are expected, Deltec recommends the use of our High Dead Load Floor System, which includes trusses designed for up to 30 psf of dead load. Higher dead or live loads in commercial buildings can be accommodated by our Commercial Load Floor System. Talk with your Project Manager for more information.

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Wall Panel Installation

8. What type of equipment do I need? How heavy are the panels?

Wall panels can weigh up to 800 lbs. Because of this and for ease of construction, Deltec recommends having an all-terrain forklift with an extendable boom and/or a crane to assist with panel installation, especially when building on piles or a second story.

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Wall Panel Anchoring

9. How is the building tied down to the foundation? Discuss how this is different for different foundation types.

For buildings on slab, the wall panels are anchored directly to the slab using Deltec-supplied concrete screw anchors. For all other foundations, Deltec supplies truss ties that attach the floor trusses to the contractor-supplied sill plate, as well as nails to attach the extended wall skirt to the truss ribbon boards.

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Wall Panel Connections

10. How are the wall panels connected together?

Wall panels are connected by metal nailer plates, usually three on the vertical face of the connection and one on the horizontal face at the top of the walls.

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Wall Panels - Windows

11. How do I install the windows?

Deltec can install windows in wall panels here in our factory. Deltec follows strict requirements for installation of flashing and tape to ensure the tightest installation possible. If Deltec is installing siding, we can also install the window trim in our factory. Doors and windows mulled to doors are to be installed on site.

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Wall panels - Siding

12. How do I install wood, HardiePlank, or vinyl siding on the wall panels?

Deltec can install siding on the wall panels here in our factory. For panels with doors or that meet another panel at the transition between wing and round, the necessary siding will be shipped loose for installation in the field. As an option, Deltec uses a flow coating system to encapsulate the HardiePlank or wood siding with stain or paint for up to a 25-year warranty on the paint.

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Roof Truss Layout

13. How straightforward is it to lay out the roof trusses?

Deltec precuts a rabbeted bevel top plate, which is installed on site at the top of each wall panel. The roof trusses drop precisely into these rabbeted bevels, ensuring accurate spacing and angles of the trusses.

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Roof System - Truss Install

14. How are the roof trusses supported and connected?

Roof trusses meet at a central steel compression ring. A steel tension collar is installed around the outside of the vertical king posts, at the bottom of the trusses, which ties the roof trusses together and removes any lateral thrust from the system.

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Roof System - Erection Jig

15. How do I assemble the self-supporting roof system?

The central steel compression ring will be supported by a temporary erection jig, which also supports the trusses until the steel tension collar and roof sheathing have been installed. The erection jig separates into pieces and can be returned to Deltec for a refund of the deposit.

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Roof System - Snow Pole

16. The snow load in our area is high. Can the Deltec roof handle the load?

Each Deltec roof system is designed to carry the specific loads for that project. In cases where a high snow load exists, the truss engineering may require a permanent central snow pole to assist with carrying the large load and controlling deflection of the roof.

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Roof System - Hardware

17. What roof hardware is provided and what do I need to provide?

Deltec provides all required hardware for the roof system installation, such as truss ties at the wall, the ring and collar roof system, and the returnable erection jig. As with the floor sheathing, Deltec does not provide roof sheathing nails, but the required size and type are given.

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Roof Sheathing

18. Do I need to cut each piece of roof sheathing to fit?

Deltec provides precut roof sheathing, shaped to follow the roof trusses, for ease of installation.

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Jig Removal

19. When can I remove the erection jig? What do I do with the erection jig when I’m done with it?

The erection jig can be removed once the roof sheathing is installed. The jig can be separated into its pieces and returned to Deltec for a refund of the deposit placed.

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Roof Underlayment

20. Does Deltec provide roof underlayment?

Deltec does provide roof underlayment with the building package. Underlayment for the Classic Metal Roof system is different than the standard roof underlayment and is included with the metal roof kit.

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Roof - Shingles

21. Does Deltec provide shingles for the roof?

Deltec provides the option of a metal shingle system that can be purchased through us. Standard shingles are not part of the Deltec package.

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High Wind / Seismic Package

22. What is included in the high wind/seismic package? What are the benefits of that package?

The high wind/seismic package includes continuous metal strapping from the roof to the foundation at each panel corner, a second tension collar to resist roof uplift, and upgraded roof over deck hardware. Benefits include the ability to resist higher shear loads created by high winds or earthquakes, as well as an increased sense of security.

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Interior Walls

23. How do I install the interior walls so that they are not load bearing?

Interior walls can be constructed using a deadwood system. Please refer to the Construction Manual for a full description of this system. Because the interior walls are non-load bearing, openings over interior doors do not require large headers.

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Mechanical/Electrical/Plumbing Systems

24. Where do I locate the mechanical, electrical, and plumbing systems and ductwork?

Mechanical, electrical, and plumbing work can be installed on-site just like in a conventional building. There is a mechanical chase in the center of the floor trusses to assist with locating MEP runs. As with conventional construction, floor and roof trusses may not be altered without the express written consent of Deltec Homes.

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General Finishing

25. Is there anything unique about finishing a Deltec after it is dried in?

Finishing a Deltec is no different than finishing a conventional building.

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Construction Guidance

26. What further construction guidance and advice is available?

Deltec provides a Construction Manual that covers assembly of the structural shell as well as installation of the non-load bearing interior walls. Deltec also has an in-house Construction Advisor to assist with any construction questions, both prior to the package arrival and during construction. We also have Factory-Trained Field Consultants available to assist on-site with the construction of the Deltec shell.

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Inspection

27. Are there any special requirements for inspecting a Deltec building?

The Deltec system is an open-panel system, meaning that once the structural shell is assembled, it can be inspected in the same manner as if it were entirely site built. Mechanical, electrical, plumbing, and insulation are all installed on-site as in conventional construction, leading to ease of inspection.

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Deltec Package

28. What does the Deltec package include?

The Deltec package includes the structural shell for the home, from the sill plate up. Deltec does not provide the foundation, mechanical, electrical, plumbing, interior insulation, interior finishes, or roof shingles. The Deltec drawings provide room layout information to assist with the construction process.

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Garage Construction

29. What should I know about the construction of a garage?

Because it is preferable to have the finish floor elevation of the garage lower than that of the living space, the garage portion of a structure will be designed to be built on a masonry or concrete stemwall. Deltec also offers the option of eliminating the stemwall by utilizing extended wall panels at the garage area.

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Engineering Seals

30. My building department jurisdiction requires plans to be sealed by a structural engineer. Are structural engineering seals available for the structure and the foundation?

Structural engineering seals are available for the contiguous 48 states. Foundation engineering is also available, if a soils report is furnished. Mechanical, electrical, plumbing, and architectural seals are not available through Deltec at this time.