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IL University


One of our goals is to continually help educate our customers, as well as our staff so that we can keep providing the best products and services possible. “IL University” is an innovative program we have developed to consistently bring you all the new practices, new materials, and more. Check below for the ones currently listed and check back regularly for short instructional videos as well as training events at different locations throughout the year. If you have an idea for a topic or have a specific problem or solution you would like to share, please email Dan Molloy at:

The IL Millwork Trustile Advantage

The IL Millwork Trustile Advantage

The advantage of ordering Trustile doors through Interstate and Lakeland Lumber is the ensured quality of every step. Here is a quick overview of how we assemble Trustile doors.

Hasting Signature Services

Routine Care & Maintenance – Swinging Doors

Routine Care and Maintenance Series Tips for Enjoying Marvin and Integrity Products

water resistent barrier

Marvin/Integrity French Door Installation

Chapter 2 - Water Resistant Barrier

placement and alignment

Marvin/Integrity French Door Installation

Chapter 3 - Placement & Alignment

straightening, shimming and fastening

Marvin/Integrity French Door Installation

Chapter 4 - Straightening, Shimming & Fastening

weatherproofing and flashing

Marvin/Integrity French Door Installation

Chapter 5 - Weatherproofing & Flashing

insulating, flooring and hardware

Marvin/Integrity French Door Installation

Chapter 6 - Insulating, Flooring & Hardware

Lumber Delivery Tech

This New House

The Greenwich House - Lumber Delivery Tech

OSI Quad Max

OSI Quad Max

OSI's revolutionary Quad Max performs in all conditions.

Marvin Adjust Hinges

Marvin French Door - How to Adjust the Hinges

The adjustable hinges on your door are designed to compensate for minor movements.

Versatex Expansion Contraction

Versatex® Expansion Contraction

Managing Expansion and Contraction

Versatex Filling Nail Holes

Versatex® Filling Nail Holes

Methods of filling nail holes

Versatex Versawrap

Versatex® Versawrap

Installing Versatex Versawrap - One piece column wrap

Versatex Painting

Versatex® Painting

Painting Versatex PVC Trim

FEIN Multi-Master Demoonstration

FEIN MultiMaster

See the FEIN MultiMaster in Action

Stanley Bostitch cordless nailer


The Bostitch® Cordless Framing Nailer delivers exactly what pros asked for... the freedom of a cordless nailer combined with the ability to drive full head wire-weld nails.

Zip Systems Roof Sheathing

Zip System®

With ZIP System® Roof sheathing system you will no longer have to worry about H clips or felt installation. These roofing panels provide superior moisture and air leakage protection.

Zip Systems Wall Sheathing

Zip System®

ZIP System® wall sheathing reduces construction headaches and provides superior performance. You will find faster installation and no rework, superior moisture management and a tighter building envelope

Fastenmaster Cortex

Fastenmaster CORTEX

Fastenmaster Cortex Concealed Fastening System for market-leading composite and PVC deck boards.

Tiger Claw Installation Gun

Tiger Claw

Installation Gun

Andersen 400 Series Replacement Windows

Andersen® 400 Series

Tilt-Wash Double-Hung insert installation

EZ Shear Siding Feature

EZ Shear™ - Siding Feature

Great for cutting laminate & wood flooring as well as siding! Cut 5/8" thick on engineered wood, VCT, Laminate and many more products.

Hastings Installation Series


MARVIN WINDOWS - Removing & Replacing the Sash Lock (Next Generation Ultimate Double Hung)

CAMO Hidden Deck Fastening System


Hidden Deck Fastening System

Henry BlueskinVP

Henry BlueskinVP

Henry BlueskinVP - An important breakthrough in building envelope technology!

Hastings Installation Series


Installation Series with Marshall Baser

rough opening preparation

Marvin/Integrity French Door Installation

Chapter 1 - Rough Opening Preparation

Trustile Installation Series

Repairing Damage on a Trustile Door!

Here is another benefit of ordering your Trustile Door through Interstate + Lakeland Lumber! Our expert craftsmen can repair any damage to match the door. This allows us to ensure your order is delivered to you on time!

Interstate Lumber

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Greenwich Store
184 South Water Street
Greenwich, CT 06830

Tel: (203) 531-8050
Fax: (203) 531-1373
Location Manager

247 Mill Street
Greenwich, CT 06830

Tel: (203) 531-8885
Fax: (203) 531-6318
Location Manager

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