Confused about insulation to be used for crawl space and attic

Hello everyone,

We just moved into an old house ( it is renovated nicely and the owner lived there for 10 years ) . Nothing wrong with the house but the insulation is lacking in some spaces.

There is an extension to the house which is a bedroom+washroom+closet. This seems to be newly built and has a crawlspace under it that is accessible from the outside. The floor of this room is super cold and we dont even use it since its freezing there. I got quotes for crawl space insulation :

They read as follows (Area for crawl space is roughly 257sq ft) Location is Cambridge , Ontario, Canada

Quote 1 : r-24 to the exterior walls and ring joists of the rear crawlspace : $1350+tax

Quote 2 : Closed cell insulation with average depth of 4" to achieve R-30 : $2181+tax

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Also looking to get Attic spaces done . 4 spaces (totalling roughly 322sq ft, all of them are equal). As there is decent space in attic spaces , the first quote said

Quote 1 : Remove existing insulation from walls and discard (wax backed batt) :$2,650.00 + tax

Improve / modernize the insulation and air sealing in the 4 attic spaces.  It will leave the spaces still accessible for storage / etc, but should greatly improve the overall comfort of the upstairs living space as the R-value will be much greater and the air sealing is currently non-existent. 

Provide and install 2" rigid (XPS) foam insulation between all wall studs (R10)

Air seal perimeter of foam board with spray foam insulation

Provide and install Rockwool batt insulation to cover all XPS foam board (R14)

Secure Rockwool in place with wire or strapping

*Provide and install foam weather stripping at all hatch perimeters

Back all hatches with 6" of rigid XPS (R30) and secure in place

Remove old insulation and any debris from site

*Foam weather stripping will be installed where weather stripping does not

currently exist

*Batt insulation to be Rockwool R14 - Safe and Sound or Comfort Batt

Quote 2 :

This company said to do roof all the way till knee walls to make the space usable.

-R-20 to the slopes of 4 knee wall corners spraying direct from soffit to peak Subtotal $ 3456.00+Tax

Quote 3:$2000

The project involves adding blown-in fiberglass insulation the four attic spaces, bringing the insulation level up to R60 for improved thermal performance and energy efficiency. While these areas will not be suitable for storage due to the depth of the insulation, they will remain accessible for any necessary maintenance or future use. Additionally, fibreglass batts will be installed on the knee walls to ensure proper insulation coverage in these areas, enhancing overall effectiveness and comfort.

Quote 4 : $2000

All products are supplied and installed. All work areas are cleaned & vacuumed. Waste is disposed of off site.

4 Knee Walls

Cellulose Loose-Fill Top-Up

Blown-In Attic Insulation Top-Up to R60 in the 4 Knee walls (including existing insulation).

Add fiberglass insulation to the knee wall walls as necessary and tyvek all 4 walls.
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I apologize for the wall of text . For crawl space quotes , it seems that quote 1 is clearly the best as they seem to be doing the same work.

For attic spaces , we do want the space to be available for storage if possible . In that case quote 1 and 2 are the ones . In those , i am not sure which one is best practice. If i did not want the space to be usable, then quote 3 and 4 seem to be the competing ones.

If someone could provide some input on what they think would be the best way to proceed , i would greatly appreciate it. I will do my best to provide any information if needed.