Attaching Medium Density Fibreboard Siding

Medium density fibreboard is an engineered word product comprising broken down hard- and softwood fibres combined with wax and resin binder. It is an affordable plywood timber substitute for the right application. However, it is a difficult material to attach as siding, and hence ends up being expensive.

Comparing Medium Density Fibreboard and Wood

The product compares well with wood across a number of dimensions. It does not have any knots and rings, enabling a consistent approach throughout a particular application. Its smooth hard, machine-made nature means a consistent surface that’s well suited for veneering, making it a popular solution for indoor paneling.

There are a variety of ways to attach medium density fibreboard to a base material. It may be doweled, glued or laminated into thicker sheets. The engineered wood product accepts panhead machine screws and T-nuts. However, this is where the flexibility ends, because the material is not entirely consistent, being fibres pressed together.

The Distinct Downside of the Material

Smooth-shank nails do not find enough resistance to grip tightly, nor do fine pitch screws. This problem is greatest near an unsupported edge, because there is no natural or artificial reinforcement. The tendency for edges to chip or break away is particularly prevalent with siding strips. We have had some success with coarse-thread screws.

It follows that siding wastage is far higher than with natural wood, fibre-cement, and vinyl siding. We have to allow for these losses when we prepare estimates to cover costs. In case you wondered why medium density fibreboard siding is expensive compared to some other alternatives, now you know why.

Summing Up Pros and Cons of Medium Density Fibreboard

The Pros to Value

  • Consistent strength and size sheets, shapes well
  • Less contraction and expansion than natural wood
  • Takes paint and wood glue well, great bonding
  • Flexible material, and holds selected fasteners well

The Cons to Avoid

  • Heavier and denser than chipboard and plywood
  • Raw board may swell and / or break when saturated
  • Humidity may cause raw board to warp and / or expand
  • Cutting and sanding may release irritating allergens
  • Takes its toll sooner on cutting tools than many woods
  • Screwing into the edges of boards causes splits

Get Honest Opinions from Valiant Exteriors

We explain ourselves well after we arrive to quote, because we believe a good customer is an informed one who makes right decision. Please call Valiant Exteriors on (403)829-1661 should you require more advice on your siding, and be assured of our honest advice every time.

More Information

Eavestrough Expansion and Contraction

Common Concerns with Vinyl Siding

Medium Density Fibreboard Is Brittle (Андрей Перцев 1967 BY Public Domain)