Which one actually keeps heat out of a room?

The DIY Reflective Insulation Sheet. Its foil facing reflects most radiant heat, while the SOFPLATE foam has no reflective layer and only fills gaps.

Can I use the SOFPLATE sheets on a window?

Only for small gaps or padding. A few small black foam sheets will not reflect sun or meaningfully cut heat gain the way a foil roll does.

Which is easier to install?

The SOFPLATE sheets, because the adhesive is built in. The reflective roll needs separate pads, and owners report those pads often let go, so plan on tape or velcro.

The reflective roll is the more durable material, with a Class A fire rating and moisture resistance. The foam sheets are thin and best for light, short-term jobs.

Is the reflective roll worth stepping up to over foam sheets?

Yes if your goal is heat or sun control. If you only need cushioning or gap filling, the foam sheets do that job without the bulk of a roll.

DIY Reflective Insulation Sheet vs SOFPLATE Self-Adhesive Foam Sheets

These are not really the same product. The DIY Reflective Insulation Sheet is a foil-faced radiant barrier for windows, garage doors and RVs, and it reflects most of the sun's heat. The SOFPLATE sheets are small black foam pads for cushioning, sealing and light DIY padding, with no reflective surface. Buy the reflective roll for heat and sun control. Buy the SOFPLATE sheets for small padding and gap-filling jobs.

Choose the DIY Reflective Insulation Sheet if you want to block radiant heat and sunlight at a window, garage door or RV panel.
Choose the SOFPLATE foam sheets if you need small self-adhesive pads for cushioning, sealing gaps or craft and repair work.

Prices

DIY Reflective Insulation Sheet: $16.95 at Insulation MarketPlace (checked today)
SOFPLATE Self-Adhesive Foam Sheets: $15.52 at Walmart (checked today)
Difference: the SOFPLATE Self-Adhesive Foam Sheets is $1.43 cheaper than the DIY Reflective Insulation Sheet today

	DIY Reflective Insulation Sheet	SOFPLATE Self-Adhesive Foam Sheets
Main job	Radiant heat and light barrier	Padding, sealing and gap filling
Surface	Reflective foil facing	Plain black foam
Sheet size	Rolls up to 60 in wide and 10 ft long	10 sheets of 8.3 x 11.8 in
Thickness	3 mm closed-cell foam core	2 mm foam
Adhesive	Separate self-adhesive pads, reported to peel off	Built-in adhesive backing
Fire rating	Class A	Not stated
Moisture	Water-resistant vapor retarder	Not rated for moisture
Cutting and shaping	Cut with scissors from a roll	Pre-cut sheets, ready to stick

Spec	DIY Reflective Insulation Sheet	SOFPLATE Self-Adhesive Foam Sheets
Color	Silver	Black
Size	24" x 10'	8.3x11.8
Material	Polyethylene (PE)	—
Item thickness	3 Millimetres	—
Product dimensions	3.05L x 0.61W metres	—
Heat blocked	up to 97% of the sun's heat	—
Foam type	3mm closed cell polyethylene FOAM	—
Included pads	35 Self Adhesive Pads	—
Application	RADIANT BARRIER, VAPOR BARRIER	—
Moisture Resistance	unaffected by humidity and moisture	—
Material Type	Reflective Foil	—
Vapor Retarder	Yes	—

Spec	DIY Reflective Insulation Sheet	SOFPLATE Self-Adhesive Foam Sheets
Product Type	Reflective Insulation	—
Insulation Type	Thermal	—
Thermal Type	Radiation	—
Coverage Area	48"x100ft	—
Thickness	1.5 mm	—
Length	100ft	—
Width	48"	—
Form	Sheet	—
Fire Rating Class	Class A	—
Facing	Highly reflective engineered foil

DIY Reflective Insulation Sheet vs SOFPLATE Self-Adhesive Foam Sheets

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DIY Reflective Insulation Sheet vs SOFPLATE Self-Adhesive Foam Sheets

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DIY Reflective Insulation Sheet

SOFPLATE Self-Adhesive Foam Sheets

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DIY Reflective Insulation Sheet

SOFPLATE Self-Adhesive Foam Sheets

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DIY Reflective Insulation Sheet

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