Wood fiber (Plyfa)

[HEM2121]

A house built in the 1990s.
How common was it NOT to use roofing felt under the roof tiles? How common was it to use Plyfa instead of roofing felt? What is the lifespan of Plyfa vs. roofing felt? Is Plyfa a risk construction when placed under the roof tiles on the roof?

 

[Argastesnickaren]

Plyfa I don't think I've seen, however, I have seen quite a few houses with masonite or just plastic.
I personally prefer raw timber and fabric or paper.
Feels a bit more stable in the long run.

 

[Dan_Johansson]

I think it's difficult to answer without knowing exactly what type of plywood it is... It can be everything from hopelessly bad (4 mm plywood laid with large gaps) to overkill (15 mm thick marine plywood with glued tongue and groove edges)...

 

[HEM2121]

I think it's difficult to answer without knowing exactly what type of plywood it is... It can range from hopelessly poor (4 mm plywood laid with large gaps) to overkill (15 mm thick marine plywood with glued tongue/groove edges).

There are no detected moisture damages, moisture content about 8-10 in the attic, which may indicate good Plyfa. A little moss on the roof tiles, but not in large amounts. It was new to us that Plyfa was laid under the roof tiles. Tar paper has its lifespan, the question is which is more durable, tar paper or Plyfa? But maybe it's completely impossible to answer?

 

[Dan_Johansson]

Lift off a few tiles and snap a photo....

 

[Stefan N]

This method is still used on low-budget houses, cheap and fast.

 

[HEM2121]

Lift up a few roof tiles and take a picture....

Not our house but we are potentially interested in buying. So the question is if we should skip this house considering possible costly renovations. The location is fantastic, but I don't want to be blinded by the location.

 

[TheGame]

It's probably something on the plywood or some treatment.
If it had been "normal," even the smallest leak would have been visible very quickly.
But who knows, maybe it's a 100% tight roof

 

[Daniel 109]

This method is still used on low-budget houses, cheap and fast.

No, then you use masonite. Plyfa can hardly be cheaper than spånt.

 

[Stefan N]

I have seen both, but masonite is more common.

 

[tergo]

Myrsjöhus has had plywood for many years before, don't know if it's still used.

 

[olotor]

A few years ago, a Myresjöhus was built in the neighborhood. They used plywood as the sub-roof, not plyfa.

 

[Daniel 109]

Plyfa and plywood are two names for the same product.

 

[Jonatan79]

Not our house, but we are possibly interested in buying. So the question is whether we should skip this house considering possible costly renovations. The location is fantastic, but I don't want to be blinded by the location.

Lift a few roof tiles during the viewing if there's a ladder on site. Also, check the attic if anything is visible from the inside. Otherwise, hire your OWN inspector.

 

[Installation]

Plyfa and plywood are two names for the same product.

If one wants to be really pedantic, plywood is a brand name that is sometimes referred to as plyfa. The board is called kryssfanér.