Fire-Rated Drywall Assemblies in Thurston, Pierce & Lewis Counties
Solis Interiors provides fire-rated drywall assemblies in Thurston, Pierce and Lewis counties. Fire-rated drywall performance depends on a complete, tested building assembly—board type, fastener spacing, joint treatment, and penetration firestopping. Solis Interiors installs certified Type X and Type C fire-barrier drywall assemblies across Lacey, Olympia, and Pierce County.
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Install fire-rated drywall to the specified assembly
A fire-rated wall depends on the assembly shown in the project details, along with the sequence for framing and board work. Treating the board as a stand-alone item can leave installation steps disconnected from the design.
Solis installs the specified fire-rated drywall assembly from the project details and required sequence. Carrying the assembly notes into the board work keeps installation connected to the drawings and the surrounding construction.
- Fire-rated drywall installed to the specified assembly.
- Board work follows the project sequence.
Here’s how we get it handled
Text us photos or call
A close-up, a wider view and your city give us a useful starting point. You can also call and talk through the work.
Agree the scope and schedule
We review the work with you, arrange a site visit where needed and put the agreed scope and finish in your estimate.
Get the space finished
Solis completes the agreed work and reviews the finish with you. Include interior painting in the scope for a complete drywall-and-paint handoff.
Have a project in mind? Send us a photo.
Tell us what needs fixing or finishing. We’ll take it from there.
Washington's middle-housing rules turned fire separation into a volume problem
HB 1110 middle housing and the HB 1337 ADU and DADU amendments pushed duplexes, triplexes, and detached accessory units into neighborhoods platted for single-family homes. Lacey Municipal Code Title 14 now allows four units per lot, six near transit, and every new dwelling-unit boundary carries a required one-hour fire separation with an STC 50 or better party wall. That makes fire-rated drywall a per-unit-line scope rather than a framing afterthought: each separation is specified, installed, and inspected on its own line and then repeated across the building.
The rating belongs to the assembly, not to the board
A sheet of 5/8-inch Type X gypsum board carries no fire rating on its own. The listed rating applies to a complete tested assembly: board type and thickness, number of layers, stud gauge and spacing, fastener type and schedule, joint treatment, and the firestopping at every penetration. We install to the named design, including UL-listed steel-stud demising walls, corridor assemblies, and shaftliners, with staggered layers and offset joints, so the wall that gets inspected is the wall that was tested.
The details that fail a fire-rated inspection
Most corrections come from the details around the board rather than the board itself: unsealed penetrations at electrical boxes and pipe chases, fasteners spaced wider than the listed schedule, joints landing on the same plane across multiple layers, and unconditioned garage ceilings that sag once half-inch board spans framing at 24 inches on center. We sequence firestop sealing with the board installation and check fastener spacing against the listed assembly before an inspection is requested.
Common questions
What is the difference between Type X and Type C fire-rated drywall?
5/8-inch Type X drywall has non-combustible glass fibers in its dense gypsum core, providing certified 1-hour fire resistance. Type C board includes expanded vermiculite to prevent shrinkage under high heat, making it essential for 1-hour and 2-hour ceiling assemblies.
What are Washington code requirements for garage-to-house fire separation?
Under IRC Section R302.6, garages attached to living areas require continuous fire separation: 5/8-inch Type X on ceilings below habitable rooms and 1/2-inch gypsum on walls adjacent to living space. Solis Interiors installs code-compliant boards with firestop caulking at all penetrations.
How are multi-family demising walls and corridor shaftliners built?
In commercial and multi-family buildings, demising walls and stair enclosures require multi-layer UL-listed assemblies (such as UL Design U419). We install staggered board layers with offset joints, specified fastener schedules, and intumescent firestopping to pass inspection on the first walkthrough.
Related services
Cities we serve
Serving Lacey, Olympia, Tumwater, Yelm, and Tenino in Thurston County.
Also serving Tacoma, DuPont, Lakewood, Puyallup, Gig Harbor, Chehalis, and Centralia in Pierce County and Lewis County.
Choose your city
- Fire-Rated Drywall in Tacoma, WA
- Fire-rated wall and ceiling assemblies in Lacey
- Rated walls and ceilings, installed in Olympia
- Fire-rated drywall for Tumwater builds
- Fire-rated walls built to plan in Yelm
- Fire-rated drywall walls and ceilings in Tenino
- Fire-rated drywall assemblies built in DuPont
- Fire-rated drywall walls built in Lakewood
- Fire-rated drywall assemblies in Puyallup
- Fire-rated drywall walls in Gig Harbor
- Fire-rated drywall to the listed design in Chehalis
- Fire-rated walls and ceilings in Centralia
Get a project estimate
Choose the work you need and tell us how to reach you.
Text us photos for a quick estimate!Send the assembly your plans call for
Share the drawings or the rated assembly listed in them, and we'll price the board and finish.