What are the first technical requirements when choosing timber?
Start by defining three numerical criteria: load in kN/m², moisture exposure (interior/exterior/submerged), and service life (temporary <6 months or permanent >10 years). These set the required density, resin grade, and protective treatment level.
Concrete formwork: 40–60 kN/m² load demands 18 mm WBP Indonesian plywood. Residential flooring: 2 kN/m² load is met by hardwood at 650 kg/m³. Load-bearing walls: C24 softwood at minimum 4x10 cm.
Also classify environmental risk: bathrooms and kitchens require MR or WBP grade, external surfaces need CCA or ACQ treatment, exits and stairs require fire-retardant treatment per SBC 801.
How do I assess timber durability and service life?
Durability is measured by three indicators: density (kg/m³), Janka hardness (kN), and rot resistance (Class 1–5 per EN 350). Higher values mean greater durability. Dense hardwood >700 kg/m³ lasts 30–100 years, treated softwood 15–30 years, untreated 5–10 years.
In Riyadh, the swing from 45°C summer to 5°C winter and low humidity stress the wood. Choose dimensionally stable species like meranti, teak, and oak for external use.
Ask the supplier for a moisture content test report not exceeding 12–14% for wood stored in Riyadh, to avoid post-installation shrinkage.
How do I balance quality and budget?
Balance is calculated by cost per use cycle, not initial cost. Example: Indonesian plywood at SAR 120 lasts 7 cycles (SAR 17/cycle), Chinese plywood at SAR 85 lasts 2 cycles (SAR 42/cycle). The Indonesian is actually 60% cheaper over the medium term despite the higher upfront price.
Allocate 8–12% of total construction cost to timber for residential buildings, 15–20% for commercial projects with finishes. Do not cut corners on formwork because failure costs many times the wood's price.
Get bids from three suppliers with identical specs and compare price against density, certificates, and origin. A 30% price gap with the same nominal spec signals fraud in origin or density.
How do I select a reliable timber supplier in Riyadh?
A reliable supplier provides five elements: mill certificate of origin, ISO 9001 and ISO 14001, density and moisture test reports, customs import invoice, and replacement guarantee for any non-conforming sheet. Avoid suppliers who refuse documents or sell 30% below market.
Verify physical inventory (warehouse, samples, project references) and committed lead time (24–48 hours within Riyadh). Suppliers without warehouses are usually middlemen who add 15–25% to price without technical value.
Ask for references from three projects similar to yours and visit one to see the wood's actual on-site performance. This step prevents many problems later.
Which certifications should I require for timber?
Required certifications on Saudi projects: SBC 201 structural, SBC 801 fire, ISO 9001 quality management, ISO 14001 environment, FSC or PEFC sustainability, CARB-P2 emissions, and E1 formaldehyde. Government projects also require Mostadam for sustainability rating.
Structural formwork: SBC 201 mandatory. Doors and exits: SBC 801 with B-s2,d0 rating per EN 13501-1. Interior furniture: E1 and CARB-P2 to safeguard indoor air quality. Mostadam-certified projects: FSC certificate for managed-forest wood.
Each document must be original with mill stamp and verifiable. Riyadh Timber attaches certified copies with every shipment for consultant and contractor review.
What are the common questions about choosing timber?
Start by calculating structural loads with the civil engineer, then define environmental exposure. These two steps resolve 70% of the type and thickness decision before considering price or origin.
Yes for external and buried wood, CCA or ACQ treatment is essential to resist rot and insects. Interior wood needs only fire-retardant treatment by location. Mill-treated wood is more effective than on-site treatment.
Request a Density Test Report from the mill for each batch. Field check: a 122x244 cm, 18 mm Indonesian plywood sheet must weigh 34–37 kg; lighter means lower density and lower quality.
Plywood for furniture exposed to load or moisture (kitchen cabinets, beds, heavy shelving), MDF for painted surfaces and light interior doors. Plywood costs 30–50% more but carries higher loads and resists moisture.
Standard items (Swedish, Indonesian, MDF) ship from stock within 24–48 hours in Riyadh. Special items (teak, meranti veneer, custom-colour MDF) need 3–6 weeks of import lead time, so plan early to avoid site delays.
Selecting cheap plywood for structural formwork; failure during casting demands demolition and re-casting, with delays exceeding 10x the price of good plywood. Never compromise wood quality on critical structural elements.
Need help choosing timber for your project?
Send the drawings and bill of quantities, and our technical team will issue a formal recommendation on type, thickness, and required certificates per element, with a complete quote within 4 working hours.