Suspended timber floor retrofit insulation QA

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Suspended timber floor retrofit insulation (Q+A)

Suspended timber floor retrofit insulation (Q+A)
About:

Q I am currently trying to find a suitable insulation material that is:

Q1 natural-based;

Mineral/Animal/Plant: many
Mineral+Plant: Hemp-lime, Earth-Cork, Cob,
Mineral: Cellular glass, Aerogel,
Animal: Sheep’s wool, Goat hair, Goose down,
Plant: Wood fibre, Hemp, Cellulose fibre, Cork, etc.
not chemical, petrochemical, hydrocarbon, plastic

Q2 relatively great thermal insulator;

A2A Conductivity?

(not plastic)
VIP Vacuum Insulated Panel,
Aerogel,

A2B Radiation?

Not plastic,
Not multifoils: (only reflective),
Cellular Glass,
Dense Wood Fibre
Cellulose fibre
Hemp-lime (improves as hydration progresses over long period)
Cork

Q3 airtight;

Foil faced (but not plastic) and taped joints None that I know about
Spray foam (but not plastic) None in market that I know about
VIP Vacuum Insulated Panel and taped joints
Cellular glass with taped joints or flood coat
Hemp-lime: Smoothing shown face will close surface
Cellulose fibre sprayed into place with or without added water

A3A Is it part of external envelop (includes suspended ground floor)

vapour open or vapour closed?

Q4 sprayable;

Cellulose fibre (Newspaper/magazine) flake, wet or dry application
Not Sprayed foaming plastic (but not plastic)
Plant based resin polyurethane (no longer made or sold in UK market)
Hemp-lime sprayed

Q5 adhesive enough to stick to horizontal surface (Should be Q1B) in this process)

Is this ground floor suspended or upper floor suspended?
Access for spray equipment?
Access to manual application?
Can the boards be lifted off, work carried out and boards relayed?

A5A (e.g. underside of floor boards on suspended timber floors). (Should be Q1A in this process)

Sprayed polyurethane (but not plastic)
Cellulose fibre (Newspaper/magazine) flake, wet application like papier mache
Hemp-lime sprayed

A5B Squeezy for compression between framing expansion and self-supporting between framing

Medium density cellulose fibre batts (poorer conductivity)
Medium density wood fibre batts (poorer conductivity)

A5C Supported by battens on sides of floor framing

High density wood fibre board (poorer conductivity)
High density cellulose fibre board (poorer conductivity)

A5D Supported by insulation support system stapled to sides of floor framing

Insumate 600 Tray G#1762 N#1658
Robust Specification G#1762 N#1658 scroll down to end
Insumate Ltd G#1761 N#1657

I have been talking to Diasen (that manufacture’s Diathonite Evolution) and their product seems to meet almost all the above criteria, however, it is a bit too expensive.

Diasen
Diathonite Evolution G#1796 N#1683
You don’t get what you don’t pay for
Save some money somewhere else: taps, ironmongery, kitchen, bathroom, etc.
It’s the right price for a 4/5 multi-functional insulation
It may be the only product that is right for all 5 of your requirements
Anything less than 5/5 may be incompetent
Check with your client before choosing 4/5 or less at the wrong lower price

I wondered if you happen to know any other materials that meets these requirement (for example I came across with “ThermoPor”)

ThermoPor

Do you know how expensive they are compared to Diathonite?

No, that’s your job, ask the manufacturer.

Their lambda value is worse though.

You get what you pay for.

I am fully aware that both Diathonite and ThermoPor are originally for external wall cladding, whilst I am interested in floor insulation,

So is it competent in a floor situation?

but I am specifically looking for a sprayable adhesive material (due to access issues),

have you checked if the spray equipment can access your floor?
See my notes above interspersed with your 5 criteria
Is spray the only answer?

whilst I also try to stay away from Spray Polyurethane Foam SPF (to avoid off-gassing issues).

The plant based spray foam that was available was withdrawn because they could not be confident the resin was ethically sourced.
Find a SPF that does not off-gas?