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MG MGB Technical - Floor seal

Currently I am redoing the floor on my 1970 MGB. I have scraped off the glued down carpet and will be cleaning off the glue, paint and surface rust. The floors are actually in very good shape considering the age. Once treated and painted, I will need to put down a new floor sound deadening kit.

Instead of spending about $100.00 on the kit, I have been thinking of an alternative. In the northern states there is an asfault product used on roofs called ice and water seal. It is a tar based thick rolled sheet that goes down under the shingles. One side has an adhesive. It may be about the correct thickness but I am not positive as it has been a few years since I used it.

I have been thinking of cutting out the pattern in this material and putting it down between the floor ridges. Then putting a second layer over the complete floor sealing everything except the drain holes.

Any thought on this?

Is it a good or bad idea to seal the complete floor?
DWM

My thoughts.
The idea of the cutting out a pattern from the membrane sounds like a good idea but I don't think it is a good idea to totally seal the floor.
Any water/moisture trapped between the membrane and the floor metal (now or in the future) will be trapped there.

There are also many other sound deading material out there if that is what you wish to accomplish.

FWIW

Bruce
Bruce Mills

That is exactly the material that I used in two cars. You'll need two thicknesses to have a level floor. I used a heat gun to "super-activate" the adhesive backing. Works very well as sound deadening on other panels as well.
Al
Al McMillan

DMW

Check the archives. There was an extensive thread on this some time back. I believe it was Bob M that noted a product available at Home Depot that does exactly what you want.

HTH

Larry
Larry Hallanger

I just used some conventional sound-deadening felt, cut out strips and blocks to fit round the ribs, then used spray adhesive. Depends on how 'correct' you want to be.
Paul Hunt 2

When I sucessfully removed all the thick factory fitted bitumen material from the floor of my MGC, I replaced it with a product called FatMat. It is a thin sticky material, about 1/3 the thickness of the original sound deadening, with an aluminium topside to it.

I purchased a 25 Sq Ft roll of it (enough for all the floorpan and boot area) on eBay for £51 inc P&P, about half the price of Dynamat.

It has certainly cut the road and exhaust noise down inside the car, especially with the hood up. I know that it is difficult to judge, like for like, but I have been pleased with the result.

Robert
R Lynex

I spent quite a bit of time looking through the archives and see that there are many options.

Al M.
Was the material that you used the tar based sheets or the rubber based product? There were comments that some of the tar based sheets would stink when they get hot but others said that was not the case. Considering the original seam sealer was tar and the original floor sound deadening material was also tar I do not see this as a potential problem.

I am going to stop by the local hardware store to see what they have.

I am still considering coverind the complete floor. All the rust I have is on the top of the floor ridges and down the sides of the ridges. I think it is due to the loose carpet rubbing the paint off and holding moisture against it. There should be something on it to protect for that.
DWM Don

I covered my floors completely with a black Dynamat type stuff. I just punched out holes for the drains. You can get that kind of thing from car audio places or panelbeater suppliers. It was self adhesive on one side and I did as Al did and used a heat gun which lets you mould it to exactly fit the ribs and ridges. I does also help the adhesive to stick better. There is a pic here: http://www.asciimation.co.nz/pics/page8.html

I did leave the area where the seat rails bolt down free so there isn't a layer of squishy stuff there under the rails although now I think of it the rails sit on those little round spacers so it probably doesn't make any difference!

Simon
Simon Jansen

Simon, enjoyed your pictures. I must ask what is the purpose of the Police Box?
Steve C.
Steve C.

Doctor Who?
Paul Hunt 2

Ah, the Police Box. It's a TARDIS. As Paul says from Doctor Who. I basically built that to house a MAME console (multiple arcade machine emulator) which allows you to play all the old arcade games on a normal PC. You typically build yourself a nice cabinet with a control panel with proper joysticks and buttons on it. I decided a normal cabinet was a bit boring hence the TARDIS. I needed a break from the MG for a while you see.
Simon Jansen

This thread was discussed between 27/12/2006 and 04/01/2007

MG MGB Technical index

This thread is from the archive. The Live MG MGB Technical BBS is active now.