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Mezzanine Flooring & Roof Underlays

Heavy-Duty Fibre Cement Mezzanine Structural Flooring, Dry Screed & Roof Decking

Replace combustible OSB, moisture-sensitive chipboard and slow-curing wet concrete screeds with high-density autoclaved mineral boards across commercial mezzanines, light-steel multi-storey buildings, loft conversions and pitched roofs. SerFibro supplies 14 mm, 16 mm, 18 mm and 20 mm smooth and calibrated floor candidates (SF-SMOOTH-EXT, SF-CALIBRATED, SF-SANDED) alongside 8–12 mm roof deck underlayments (SF-SMOOTH) matched to each variant’s Technical Data Sheet (TDS). Note that joist centre spacing (such as 300, 400 or 600 mm), live/point load capacity and screw schedules must always be calculated by your project’s structural engineer.

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Heavy-duty 18 mm autoclaved fibre cement mezzanine floor decking boards fastened with countersunk screws onto cold-formed steel joists
Representative surface & application visual — final shade, relief depth, and batch texture are verified via physical sample prior to order.

Product Quick Specification Summary

Flooring Thickness Candidates 14 mm · 16 mm · 18 mm · 20 mm (matched to TDS & structural calculation)
Roof Underlay Candidates 8 mm · 10 mm · 12 mm beneath shingles, standing-seam metal & tiles
Typical Joist Grids 300 / 400 / 600 mm centres over SerProfil C-joists, hot-rolled steel or timber
Logistics & Handling Note High unit board mass (~70–105 kg/sheet at 16–20 mm); pallet pcs adjusted to payload

01 Dry Mezzanine Floor Decks Without Concrete Curing Delays

Retail store mezzanines, warehouse office platforms, hotel renovations and multi-storey modular steel buildings benefit from dry structural decking using 14 mm, 16 mm, 18 mm or 20 mm autoclaved boards (SF-SMOOTH-EXT, SF-CALIBRATED). Eliminating poured screed lowers dead load on columns and foundations while allowing floor finishes to proceed immediately after fastening.

  • Non-combustible mineral composition (EN 13501-1 Class A1 per uncoated variant TDS) outperforms OSB and plywood in fire-regulated commercial mezzanines.
  • High board density (~1300–1450+ kg/m³ class depending on variant TDS) improves airborne sound reduction between storeys.
  • Weather-tolerant during open-shell construction phases where rain exposure would swell wood-based floor panels.

02 Joist Spacing (300 / 400 / 600 mm), Bearing Width & Countersunk Fastening

Structural floor performance relies on coordinating board thickness with joist centre-to-centre spans—commonly 300 mm, 400 mm or 600 mm (or modular 417 / 625 mm matched to 1250 mm board width)—verified by the project’s static engineer for uniform live loads (kN/m²), caster/rack point loads and deflection limits (such as L/360 or L/480 under brittle floor tiles).

  • Lay boards perpendicular to primary joists in a staggered brick-bond pattern and support transverse joints on continuous noggings/blocking.
  • Ensure adequate steel flange width at board butt joints so both adjacent board edges maintain required minimum edge distances.
  • Fasten with winged self-drilling countersunk structural screws tailored to cold-formed or hot-rolled steel gauge, keeping heads flush.

03 Calibrated Floor Substrates & Acoustic Impact-Sound Decoupling

Thin commercial floor coverings—such as luxury vinyl tile (LVT), sheet PVC, carpet tiles, epoxy coatings and glued engineered parquet—telegraph any thickness lippage across floor joints. Double-sided calibrated or sanded boards (SF-CALIBRATED, SF-SANDED) deliver precision thickness control, while elastomeric strips on joists and floating mineral-wool dry-screed layers control footstep noise.

  • Leave 3–5 mm movement joints between floor boards (filled per floor finish system spec) and 10–15 mm perimeter expansion gaps at walls.
  • Apply EPDM or closed-cell acoustic decoupling tape along steel joist top flanges to prevent metal-to-board creaking under foot traffic.
  • Use decoupling membranes or flexible C2TES1/C2TES2 adhesives when laying ceramic or porcelain floor tiles over steel-framed mezzanines.

04 Pitched Roof Deck Sheathing Beneath Shingles, Standing Seam & Tiles

On pitched steel or timber roofs—especially in hotels, schools, public facilities and wildfire-exposed villas—8 mm, 10 mm and 12 mm autoclaved fibre cement boards (SF-SMOOTH, SF-SMOOTH-EXT) replace rot-prone OSB roof decks beneath bitumen shingles, zinc/aluminium/painted-steel standing-seam roofs and ventilated tile counter-battens.

  • Install a high-temperature breathable roof underlayment / structured separation mat beneath dark standing-seam metal roofs.
  • Verify rafter/purlin spacing against local snow load (kN/m²) and wind uplift suction before selecting 8 mm, 10 mm or 12 mm boards.
  • Confirm pull-out holding capacity of shingle nails or standing-seam fixed/sliding clips directly into framing or engineered anchors.

05 Heavy-Gauge Sheet Mass, Pallet Tonnage & Safe Mezzanine Hoisting

Unlike 8 mm facade sheets, structural 16 mm, 18 mm and 20 mm boards in 1250 × 2500 mm or 1250 × 3000 mm formats weigh roughly 70 kg to over 105 kg per single sheet. Both road/container payload calculations and jobsite hoisting procedures must account for this concentrated mineral mass from day one.

  • Factory pallets of 16–20 mm boards contain fewer sheets per pallet (e.g. 20–35 pcs) so gross pallet weight stays within forklift limits.
  • Never stack full 1.5-ton pallets at mid-span on unbraced mezzanine joists—place pallets only over primary columns/beams verified by the engineer.
  • Carry individual heavy boards vertically on edge with two-to-four crew members or vacuum lifters; never carry flat horizontally.

06 Integrated Mezzanine & Roof Supply with SerProfil & CFY Engineering

Through our commercial and engineering hub in Maltepe/Istanbul—with factory dispatch locations confirmed per order—SerFibro supplies heavy-duty floor and roof boards domestically and for export, while sister brand SerProfil and our CFY Engineering & Architecture team can engineer and supply cold-formed steel floor/roof framing under separate project scopes.

  • Combine 16–20 mm mezzanine floor pallets and 8–12 mm roof deck pallets in coordinated multi-truck steel building shipments.
  • Request exact variant TDS mechanical properties (MOR, MOE, density) early so your structural engineer can finalize span tables.
  • Send your floor/roof m², joist grid and target thickness to +90 505 507 04 18 or [email protected].
Mezzanine Flooring & Roof Underlay Enquiry Matrix
Engineering Parameter Buyer Specification Input Supply & Static Relevance
Application & Load Profile Mezzanine office/retail floor, dry screed or pitched roof deck Separates 14–20 mm floor candidates from 8–12 mm roof sheets
Thickness & Surface Finish 14 / 16 / 18 / 20 mm smooth (SF-SMOOTH-EXT) vs calibrated (SF-CALIBRATED) Matches flatness tolerance to LVT/parquet vs tile/industrial finish
Joist / Purlin Grid 300 / 400 / 600 mm centres + cold-formed steel, hot-rolled or timber Checks alignment of 1250 × 2500 / 3000 mm sheet joints on supports
Gross Sheet Count & Tonnage Piece count per format/thickness + truck or 20ft container preference Heavy boards hit payload limits well before volume capacity
Site Unloading & Steel Scope Forklift/crane capacity at site; optional SerProfil joist enquiry Confirms safe pallet weight cap and optional CFY structural scope

Structured B2B Quotation & Sample Request (Direct WhatsApp)

Compile single or multiple fibre cement product lines, thicknesses, formats, and destination details into a structured technical summary sent directly to our export desk on WhatsApp (+90 505 507 04 18). Zero server form queues.

Product Specification Lines

For multi-sheet CAD/PDF packages, you may also email: [email protected]

Related Fibre Cement Product Families

Frequently Asked Technical & Commercial Questions

Can SerFibro confirm whether 16 mm, 18 mm or 20 mm board covers our mezzanine load without a static calculation?

No—selecting structural floor thickness and joist spacing (such as 300, 400 or 600 mm centres) always requires verification by a qualified structural engineer based on uniform live loads, concentrated wheel/leg loads, deflection criteria and the exact variant TDS. If you need structural engineering alongside material supply, our CFY Engineering & Architecture team can evaluate this as a dedicated project scope.

What advantages do autoclaved fibre cement floor and roof boards offer over OSB or plywood?

Autoclaved mineral boards provide EN 13501-1 Class A1 non-combustibility (verify uncoated variant TDS), immunity to fungal rot and wood-boring insects, minimal moisture swelling during construction weather exposure and substantially higher acoustic mass—making them ideal for fire-regulated commercial mezzanines, hotels and public roofs.

When should we specify calibrated (SF-CALIBRATED) or sanded (SF-SANDED) boards for mezzanine floors?

Specify SF-CALIBRATED or SF-SANDED whenever thin resilient floorings (LVT, PVC sheet, linoleum), carpet tiles, resin coatings or direct-bonded parquet/ceramics will be applied without a thick self-levelling screed, as tight thickness tolerances prevent step ridges along board seams.

What fastener type is used to fix 16–20 mm fibre cement boards onto steel floor joists?

Contractors typically use hardened, corrosion-coated winged self-drilling countersunk structural screws: the breakaway reamer wings bore clearance through the dense mineral board so threads don’t jack the sheet upward, then snap off on steel contact while nibs under the head countersink flush.

How does heavy 16–20 mm board weight affect export container or truck shipments?

Dense structural boards reach road-axle or 20-foot container payload caps (~24–26.5 metric tons depending on route/carrier) long before filling volume. We adjust sheet counts per pallet for safe forklift handling and confirm exact gross pallet weights and dispatch points per order via +90 505 507 04 18 or [email protected].

Ready to Verify Formats, Finishes & Export Delivery Terms?

Share your target board thickness, outer dimensions, finish state, and destination port. Our commercial office prepares a product-matched quotation and sample dispatch plan.

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