Can you use this to lay the ditra on plywood as well? Or just ditra to tile?

This is only used for laying the Ditra to plywood or concrete. Use your 1/4", 3/8", 1/2" trowels as needed to adhere tile to ditra

Is this 4.5 x 4.5 [11/64 x11/64 ] trowel the correct 1 for 5/16 ditra underlayment?

NO. Use the Ditra XL trowel for 5/16" Ditra (XL). From the Schluter Installation handbook: " Using a thin-set mortar that is suitable for the substrate, apply the thin-set mortar (mixed to a fairly fluid consistency, but still able to hold a notch). For DITRA use a 1/4" x 3/16" (6 mm x 5 mm) V-notched trowel, 5/16" x 5/16" (8 mm x 8 mm) V-notched trowel, or the DITRA trowel which features a 11/64" x 11/64" (4.5 mm x 4.5 mm) square-notched design. For DITRA-XL use a 1/4" x 1/4" (6 mm x 6 mm) square-notched trowel or the DITRA-XL trowel, which features a 1/4" x 1/4" (6 mm x 6 mm) square-notched design. "

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Schluter Ditra Square-Notch Trowel, 11/64" X 11/64", 1-Pack

Product ID: 11165023

Details

Brand
Schluter
Color
Silver
Grip Type
Ergonomic
Handle Material
Plastic
Item Highlight
Ideal for and
Item Weight
12.8 ounces

✋Ergonomic handle reduces hand fatigue

💪Durable metal blade for long-lasting use

🛠️11/64" x 11/64" precision square-notch

¥13387

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Elevate your tiling game with precision and comfort – don’t get left behind!

BUILT TO LAST - Robust metal blade engineered for sustained professional and DIY performance.
PRECISION PERFECTED - Square-notch design ensures flawless adhesive application every time.
COMFORT IN EVERY GRIP - Ergonomic handle crafted to minimize fatigue during extended tiling sessions.
CONFIDENCE GUARANTEED - Backed by a 2-year limited warranty for peace of mind on every project.
VERSATILE COMPATIBILITY - Optimized for Ditra, Kerdi, and Ditra-Heat systems for seamless installation.

The Schluter Ditra Square-Notch Trowel features an 11/64" x 11/64" notch size ideal for precise adhesive application with Ditra, Kerdi, and Ditra-Heat systems. Its durable metal blade and ergonomic handle ensure long-lasting use and reduced hand fatigue, making it a trusted tool for professionals and serious DIYers alike. Supported by a 2-year limited warranty, this trowel guarantees reliable performance and superior bonding for flawless tile installations.

Specifications

ASIN	B003IS31TS
Best Sellers Rank	#52,935 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #20 in Masonry Hand Trowels
Brand Name	Schluter
Color	Silver
Customer Reviews	4.8 4.8 out of 5 stars (783)
Grip Type	Ergonomic
Handle Material	Plastic
Item Dimensions	16.6 x 5.8 x 4.3 inches
Item Highlight	Ideal for Installing Ditra, Kerdi, and Ditra-Heat - TRL-DIT
Item Weight	12.8 ounces
Manufacturer	Schluter Systems
Manufacturer Part Number	FBA_UWG4-4999
Model Number	FBA_UWG4-4999
Number of Items	1
Number of Packs	1
Style Name	Contemporary
Unit Count	1 Count

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