Portable_Siding_Specs.pdf
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- Attached to
- Portable Buildings - Maintenance & Repairs
- Solicitation number
- 25/26-0045
- Issued by
- San Bernardino County, California
About this file
This is an exterior siding specifications document for the Fontana Unified School District's Portable Buildings – Maintenance & Repairs contract opportunity. The document establishes mandatory standards for siding materials, installation procedures, and fastening requirements for portable building repairs across the District's 45 school sites serving approximately 32,000 students in San Bernardino County, California. T-111 exterior grade siding is designated as the only approved primary exterior siding material, with 5/8" No-Groove Rough Sawn exterior plywood permitted only in limited supplemental applications such as skirting and soffits where required to match existing aesthetics. Sealed bids are due no later than 2:00 pm on Tuesday, May 26, 2026, through the Procurement Portal at https://procurement.opengov.com/portal/fusd. The contract resulting from this bid will have a duration of four additional years, not to exceed five years total.
Installation requirements mandate that existing damaged siding be removed and replaced in kind using new T-111 siding, installed plumb and flush to existing framing, primed on both sides, and ready to receive paint. Fasteners must consist of hot-dipped galvanized 10d box nails or equivalent galvanized framing nails installed at specified nailing schedules: 6" on center at edges and boundaries, 12" on center in field areas, and 3" on center at T-111 panel edges. New Z-metal flashing must be provided at all belly bands, horizontal transitions, and trim interfaces impacted by repairs. The District estimates annual portable building maintenance and repair costs may reach up to $1,500,000.00, though this figure is provided for informational purposes only and does not constitute a guarantee or commitment to spend this amount. No substitutions or deviations from T-111 siding are permitted without prior written authorization from the District.
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Text version
5.11.26
Exterior Siding Specifications – Portable Buildings
Approved Siding Materials Primary Exterior Siding:
T-111 exterior grade siding shall be the ONLY approved exterior siding material for portable building repairs.
Supplemental Material (Where Applicable Only):
5/8" No-Groove Rough Sawn exterior plywood (PlySawn) may be used only in limited locations such as skirting and soffits, where required to match existing materials and aesthetics.
PlySawn shall not be utilized as a wall siding replacement unless specifically authorized in writing by the District.
Installation & Preparation Requirements Existing damaged siding shall be removed and replaced in kind using new T-111 siding.
New T-111 siding shall be exterior grade, installed plumb and flush to existing framing, and primed on both sides, ready to receive paint.
Painting shall be performed by others unless otherwise specified in the scope of work.
5/8" PlySawn material, when used, shall be exterior-rated and limited strictly to authorized locations.
Fastening Requirements Fasteners may be installed using either hand-driven or pneumatic (gun-driven) methods.
Approved fasteners shall consist of hot-dipped galvanized 10d box nails or equivalent galvanized framing nails when installed with a pneumatic nail gun.
Pneumatic fasteners shall comply with manufacturer recommendations and be equivalent in size, corrosion resistance, and holding capacity to 10d box nails.
Nailing schedule:
Edges and boundaries: 6" on center
Field: 12" on center
T-111 panel edges: 3" on center where applicable.
Flashing & Accessories Provide new Z-metal flashing at all belly bands, horizontal transitions, and trim interfaces impacted by siding repairs.
Any soffits, skirts, or belly bands removed or disturbed during siding repairs shall be properly reinstalled or replaced.
Intent The intent of these specifications is to maintain uniformity, durability, and consistency across all District portable buildings.
No substitutions, alternates, or deviations from T-111 siding shall be permitted without prior written authorization from the District.
| Exterior Siding Specifications – Portable Buildings |
| Approved Siding Materials |
| Installation & Preparation Requirements |
| Fastening Requirements |
| Flashing & Accessories |
| Intent |
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