GoBoard is manufactured by Johns Manville, not James Hardie. This lightweight foam-core backer board solves the weight and installation speed problems that plague traditional cement boards in Montana construction.
The 9-Pound Advantage
At approximately 9 pounds per sheet, GoBoard is 80-85% lighter than cement boards. Traditional cement boards weigh 45-55 pounds for the same 3’ x 5’ sheet. That’s the difference between one-person handling and a two-person struggle. For contractors hauling materials up narrow staircases or working solo on bathroom remodels, the weight reduction changes the job fundamentally.
The lightweight design matters even more on remote Montana jobsites. Getting materials to a second-story bathroom in a Yaak cabin or hauling sheets through tight spaces becomes manageable. No more blown-out backs from wrestling heavy cement boards into position.
GoBoard cuts with a standard utility knife. Score and snap. No power saws throwing silica dust into the air. No hearing protection needed. The clean cutting means indoor winter work proceeds without contaminating finished spaces with concrete dust.
Built-In Waterproofing That Actually Works
The closed-cell polyisocyanurate foam core with reinforced surface facing creates inherent waterproofing. Water permeance tests at less than 1.0 perm per ASTM E96 — that’s vapor-tight enough to eliminate the separate waterproofing membrane step entirely.
While HardieBacker often requires a separate liquid or sheet membrane for wet areas, GoBoard provides integrated waterproofing. Installation requires only sealing joints, corners, and fastener heads with GoBoard Pro Sealant. That’s it. The board itself handles the waterproofing.
| Specification | GoBoard Value | Testing Standard |
|---|---|---|
| Water Permeance | < 1.0 perm | ASTM E96 |
| Panel Weight | ~9 lbs (3’ x 5’) | Manufacturer |
| Thickness | 1/2 inch (12.7 mm) | Manufacturer |
| Panel Size | 3 ft x 60 in | Manufacturer |
Installation Speed for Short Building Seasons
GoBoard installs up to 2x faster than HardieBacker due to weight and lack of membrane steps. Contractors can apply thin-set mortar and tile the same day after sealant skins over. For Montana’s compressed building season, cutting a full day from bathroom turnaround time means fitting in more jobs before freeze-up.
The installation sequence stays simple. Prepare substrate with studs at 24” on center maximum, cut panels with utility knife, fasten to framing using GoBoard Fasteners at 8” spacing on walls or 12” on floors, then seal all joints and fastener heads with GoBoard Pro Sealant.
Compatible mortars include polymer-modified thin-set (ANSI A118.4) or dry-set mortars (ANSI A118.1), while GoBoard Pro Sealant or standard GoBoard Sealant handles the waterproofing at joints.
Performance That Meets Code
ICC-ES ESR-3767 evaluation report and ICC-ES PMG-1439 certification for plumbing, mechanical, and fuel gas applications back GoBoard’s performance claims. The product meets ASTM C627 standards for floor installations, critical for tile system performance.
Applications span shower walls, tub surrounds, bathroom and kitchen walls, floors, ceilings in wet areas, countertops, vanities, and even exterior decks per manufacturer instructions. The versatility comes from the foam core’s stability — it won’t swell, rot, or degrade from moisture exposure.
The manufacturer backs GoBoard with a 10-year limited warranty when installed according to instructions using approved accessories. That requires using their sealant and fastener system, but the integrated approach eliminates compatibility guesswork.
The Trade-Offs
Based on 430+ reviews at major retailers, GoBoard averages 4.7 out of 5 stars. Contractors praise the extreme light weight, easy cutting, and time saved on waterproofing, while noting the higher price per sheet than basic cement board and the requirement for specific sealant at joints.
The premium pricing makes sense for bathroom remodels where labor savings offset material costs. For large commercial jobs where material cost dominates, traditional cement board might pencil out better. But for the typical residential bathroom or kitchen backsplash, GoBoard’s installation advantages justify the upfront investment.
Frequently Asked Questions
Q: Can GoBoard really support floor tile installations?
Yes, GoBoard meets ASTM C627 standards and is approved for floor applications including entryways, mudrooms, and bathrooms. Floor installations require 12-inch fastener spacing.
Q: What’s the actual difference between GoBoard and HardieBacker?
GoBoard weighs 9 pounds versus HardieBacker’s 45-55 pounds, includes integrated waterproofing while HardieBacker requires separate membranes, cuts with a utility knife instead of power tools that create dust, and installs up to 2x faster.
Q: Do I need special fasteners for GoBoard?
GoBoard works with GoBoard Fasteners, GoBoard Washers, or #7-9 exterior-grade wood/metal screws. The manufacturer offers specific fastener lengths and washers designed for the foam substrate.
Q: Is GoBoard actually made by James Hardie?
No, GoBoard is manufactured by Johns Manville (JM). James Hardie makes HardieBacker cement board — they’re competing products from different manufacturers.
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