Suspended Timber Floor, Insulation

Keedowah

We are in the middle of buying a house and are planning a few jobs.

The house has suspended timber floors and one of the jobs that I am hoping to do myself is insulating under the floorboards.

Here is good post on what to do:
http://www.restorationcouple.com/2014/03/07/removing-insulating-and-restoring-a-suspended-wooden-floor/

My questions are:

1. What is the preferred type of insulation? These guys are using sheep wool, would anyone have a preference for this over rigid insulation? What thickness should I go for?

2. If going for the sheep wool (or similar), what is the netting the you use underneath - is it a regular item you can get in a builders merchants? Fairly cheap I take it?

3. Once the insulation is in place, the membrane that goes over it - what sort should be used?

4. I have a number of rooms that need to be tackled - the main one being 12' * 12'... would you think it would be achievable to get the work complete (bar oil/varnish) in 2 days? (I realise it depends on any unforeseen items cropping up etc. Would it be a problem leave a couple of rooms for later in the year - would it have an adverse affect on the work completed?

5. The guys in the video above use shims to fill any gaps in the floorboards - something I can pick up in a builders merchants - or make myself?

6. Maybe I should have started with this... The rooms are currently carpeted - I'm hoping that the original wood floors are still in place... if not I'll be looking to get reclaimed rather than new floorboards - anything I should be looking for? Any idea on price?

Anything I should be aware of, worried about?!

Thanks!

Calahonda52

Page 146 and following shows how it can be done also.
https://www.nsai.ie/S-R-54-2014-Code-of-Practice.aspx

One consideration will the garden netting they used is that it allows the cold air to pass through the bottom face of the sheeps-wool, therefore reducing its effectiveness as air is the insulation, not the wool: think woolly jumper/windy day/wind breaker.

This is why, in part, why I prefer the second option on page 150.

The fifth point is the most important,
to improve airtightness, seal the edges of the insulation with a proprietary sealant, or, alternatively, lay an airtightness membrane over the whole area, staple to joists, overlapping and sealing, and lap up the walls under skirting;

what I do is tape the joists in the middle of the floor and use at the airtight membrane around the perimeter and up the wall behind the skirting.

Re two days, very optimistic.

What part of the world are you in?

Keedowah

Thanks Calahonda52 - we are in the north east.