What is asfaboard and what does it look like?

[Skalman9]

Hi,

Does anyone have a couple of pictures and a description of what asfaboard is?

I have a house from 1968 and wonder if this material was used in the walls and floors?

Does anyone know how to be sure that it is asfaboard and not another material?

Links would be appreciated.

Regards

 

[FredrikR]

Hi,

Does anyone have a couple of pictures and a description of what asfaboard is?

I have a house from 1968 and wonder if this material was used in the walls and floors?

Does anyone know how to be sure it is indeed asfaboard and not some other material?

Links would be appreciated.

Best regards

https://www.byggmax.se/asfaltsboard

Here you see a photo.

 

[Skalman9]

[link]

Here you can see the photo.
[image]

But it says asphalt board and not asfa board, I am an amateur but is it really the same thing?

Then I think they can be light, like particle boards or?

 

[FredrikR]

But it says asphaltboard and not asfaboard, I'm an amateur but is it really the same thing?

Then I think they can be light, like chipboards or?

Yes, it's the same thing.
Haven't you come across Treetex then?
A porous board that can be marked without much force.

https://sv.m.wikipedia.org/wiki/Treetex

 

[Skalman9]

Will investigate a little more over the weekend and maybe get some pictures up.

Let’s see... Some follow-up questions about asfaboard:

1. Are they all black/gray?
2. If the construction has tar paper, was asfaboard also used or was it either-or?
(now I'm assuming they were both used as wind protection, but I could be wrong)

 

[Karrock]

My house was built in 1965 from "fiberplank," which seems to be a cross between the light treetexen and the dark asffaboarden. Medium brown, slightly firmer, slightly lightly oily material. In the interior walls, there are three 1" boards together with wooden lamellas so that it becomes 75*300m "spontplank" in the outer wall instead of 4".

Could it be something like that you have?

 

[AndersS]

My house was built in 1965 from "fiberplank," which seems to be something between the light treetex and the dark asffaboard. Medium brown, a bit firmer, slightly oily material. In the interior walls, there are three 1" boards joined with wood slats, making it 75*300mm "tongue-and-groove planks" in the exterior wall instead of 4".

Could it be something like that you have?

If it's a HultsfredsHus, at that time Sweden's largest house factory and today a thing of the past.😉

 

[zarkov]

But it does say asphalt board and not asfaboard, I'm an amateur but is it really the same thing?

Then I think they can be light, like chipboard, right?

Asfaboard was probably a brand back in the good old days, now there are several manufacturers and it's called asphalt board. It is wood fibers that are hot-pressed into boards and soaked with bitumen.

It was (is) used as wind protection in facades and should not be used indoors due to its hydrocarbon content.

 

[13th Marine]

We have asfaboard as wind protection as @zarkov writes, looks like in @Karrocks' pictures, kind of like a chipboard with a gray-brown color.
House built in '71

 

[Oldboy]

I have a house from 1968 and wonder if this material was used in the walls and floors?

Asfaboard is used as a wind protection board in exterior walls. It is not used indoors or in floors, except sometimes as subfloor boards. Indoors, treetex boards were used, which are the same as asfaboard minus the asphalt/bitumen/hydrocarbon impregnation that makes asfaboard moisture-resistant. Alternatively, HDF/masonite boards were also used indoors in both walls and floors. Various shades of brown.

 

[Eld]

In my house built in '42, there is Treetex on the inside of the exterior walls to even out the planks and insulate. Some of the ceilings also have Treetex. On the interior walls, the planks are covered with masonite.

I have seen asfaboard used for the blind bottom in crawl spaces into the 1990s.