Enviroshake Products Are Not Subject to 2026 U.S. Section 338 Tariffs

As of September 23, 2026, Enviroshake, Envirocool, Enviroslate, and Enviroshingle products imported into the United States are not subject to the 50% U.S. Section 338 tariffs on specified Canadian goods.

Last updated: September 23, 2026

Enviroshake's third-party customs broker has verified that these product lines enter the United States under HTSUS 3925.90.00, covering other builders' ware of plastics.

HTSUS 3925.90.00, and all of heading 3925, is absent from the White House Section 338 annexes cited below and from the complete list in U.S. Customs and Border Protection CSMS #69851916, effective September 15, 2026.

Our customs broker has also confirmed that no Section 232 or other additional U.S. duty currently applies to Enviroshake products under this classification. Because the products meet CUSMA rules of origin and carry the required certification, they also receive preferential duty-free treatment under CUSMA.

The direct answer

Enviroshake products are not affected by the current 50% Section 338 tariffs because HTSUS 3925.90.00 is not one of the tariffed classifications.

This applies to:

• Enviroshake
• Envirocool
• Enviroslate
• Enviroshingle

The current Section 338 measures do not impose a blanket tariff on everything made in Canada. They apply only to specified products identified by their Harmonized Tariff Schedule classifications.

Why Enviroshake is outside the Section 338 tariff scope

The Section 338 lists cover selected Canadian goods, including alcoholic beverages, dairy products, motor vehicles, paper and wood products, furniture, and numerous other products.

They also include several plastics classifications, such as HTSUS 3918.10.10 for certain vinyl floor coverings and HTSUS 3926.90.99 for certain other articles of plastics. This confirms that plastics are not excluded as a general category.

Enviroshake is outside the tariff scope for a more specific reason: its classification, HTSUS 3925.90.00, is not on the Section 338 lists.

The distinction matters. Enviroshake's Section 338 status is based on its HTSUS classification, not on a blanket exemption for Canadian or CUSMA-compliant goods.

The original Section 338 duties took effect on August 22, 2026. The product scope was modified effective September 15, 2026, and CBP subsequently published a complete list of the affected classifications. Neither HTSUS 3925.90.00 nor heading 3925 appears on that list.

CUSMA remains in force, but it is a separate issue

CUSMA remains fully in force. The Government of Canada explains that the 2026 joint review is not an expiry date and that the agreement remains in force until 2036.

Enviroshake products meet the applicable CUSMA rules of origin and qualify for preferential tariff treatment. That treatment eliminates the ordinary U.S. customs duty that would otherwise apply to HTSUS 3925.90.00.

CUSMA and Section 338 must be analyzed separately:

1. Section 338: HTSUS 3925.90.00 is not on the Section 338 product lists, so the 50% additional tariff does not apply.
2. Ordinary customs duty: Enviroshake products satisfy CUSMA rules of origin, so they qualify for duty-free treatment instead of the ordinary general rate.

The Section 338 proclamations do not contain a general exemption for CUSMA-compliant goods. If HTSUS 3925.90.00 were added to a Section 338 list in the future, CUSMA status alone would not automatically remove that additional tariff.

U.S.-Canada tariff timeline: 2025-2026

February and March 2025: IEEPA tariffs

The United States announced tariffs on Canadian goods under the International Emergency Economic Powers Act, or IEEPA. Canadian goods qualifying under CUSMA were exempted from those measures.

February 20, 2026: Supreme Court decision

In Learning Resources, Inc. v. Trump, the U.S. Supreme Court held that IEEPA did not authorize the President to impose tariffs, invalidating the IEEPA tariff measures.

February 24, 2026: Section 122 surcharge

A temporary 10% global import surcharge took effect under Section 122 of the Trade Act of 1974. CUSMA-compliant Canadian and Mexican goods were exempt.

The U.S. Court of International Trade held the Section 122 action unlawful in May 2026 in litigation brought by specific plaintiffs. The temporary surcharge was scheduled to end, and did end, on July 24, 2026.

July and August 2026: Section 338 measures

On July 20, 2026, the White House issued three Section 338 proclamations covering specified Canadian products connected to alcoholic beverages, dairy, and motor vehicles.

Following a three-day suspension, the 50% additional duties took effect on August 22, 2026.

September 15, 2026: Product scope modified

The White House modified the product scope, and CBP implemented the updated list for entries made on or after September 15, 2026.

CBP's complete list does not include HTSUS 3925.90.00.

September 29, 2026: Certain import exclusions

Separate proclamations exclude certain Canadian dairy and motor-vehicle goods from importation beginning September 29, 2026. Those exclusions do not apply to Enviroshake products and do not change Enviroshake's tariff status.

What this means for pricing and orders

Enviroshake pricing remains unchanged. Enviroshake has not added a Section 338 tariff surcharge to current U.S. pricing or orders.

U.S. homeowners, contractors, builders, architects, and property professionals can continue to request samples, obtain quotes, and place orders through the normal Enviroshake channels.

Tariff rules and product lists can change. Enviroshake will monitor official White House, CBP, and USITC updates and will update this permanent page if the treatment of HTSUS 3925.90.00 changes.

For a current quote or project-specific information, contact:

Enviroshake
1130 Wellington Street
Dresden, Ontario
Canada

Email: info@enviroshake.com
Phone: +1-866-423-3302

Frequently asked questions

Are Enviroshake shingles affected by the 2026 Canadian tariffs?

No. As of September 23, 2026, Enviroshake, Envirocool, Enviroslate, and Enviroshingle products are not subject to the 50% U.S. Section 338 tariffs on specified Canadian goods. They enter under HTSUS 3925.90.00, which is not on the current Section 338 lists.

Are there currently any U.S. tariffs on Enviroshake products?

Enviroshake's customs broker has confirmed that no Section 338, Section 232, or other additional U.S. duty currently applies to these products under HTSUS 3925.90.00. The products also qualify for CUSMA preferential treatment, eliminating the ordinary customs duty.

Does CUSMA protect Enviroshake from the 50% Section 338 tariff?

Not directly. The 50% tariff does not apply because HTSUS 3925.90.00 is not on the Section 338 lists. CUSMA separately provides duty-free treatment for the ordinary customs duty because Enviroshake products meet the applicable rules of origin.

Is CUSMA still in effect?

Yes. CUSMA remains fully in force. The Government of Canada states that the 2026 joint review is not an expiry date and that the agreement remains in force until 2036.

Will the 2026 tariffs raise Enviroshake prices?

Current Enviroshake pricing remains unchanged, and Enviroshake has not added a Section 338 tariff surcharge to U.S. quotes or orders.

Which Enviroshake products use HTSUS 3925.90.00?

Enviroshake, Envirocool, Enviroslate, and Enviroshingle are imported into the United States under HTSUS 3925.90.00, as verified by Enviroshake's third-party customs broker.

Are all Canadian plastics excluded from Section 338 tariffs?

No. The Section 338 lists include several other plastics classifications. Enviroshake is outside the tariff scope specifically because HTSUS 3925.90.00 is not listed.

Could Enviroshake's tariff status change?

The U.S. government can amend tariff measures and HTSUS product lists. Enviroshake will monitor official changes and update this page in place so customers have one current, permanent source.

Sources

Current tariff and trade-agreement guidance

• CBP CSMS #69851916: Modifying Section 338 Additional Duties on Certain Goods of Canada
• Congressional Research Service report R49349: U.S. Tariffs on Canadian Imports
• Global Affairs Canada: Joint Review of CUSMA
• USITC Harmonized Tariff Schedule archive
• U.S. Supreme Court: Learning Resources, Inc. v. Trump
• White House: Temporary Section 122 import surcharge
• U.S. Court of International Trade Section 122 decision

July 2026 Section 338 proclamations and annexes

• Alcoholic beverages proclamation: Annex I and Annex II
• Dairy proclamation: Annex I and Annex II
• Motor vehicles proclamation: Annex I and Annex II
• August 18 temporary suspension proclamation

September 2026 modifications and exclusions

• Alcoholic-beverage scope modification: Annex I and Annex II
• Motor-vehicle scope modification: Annex I and Annex II
• Dairy import exclusion: Annex
• Motor-vehicle import exclusion: Annex

This page reports Enviroshake's tariff treatment based on the cited official materials and review by the company's third-party customs broker. Tariff classification and treatment for other products may differ.