Show the actual reveals.
Keep the joint pattern with the proposed exterior-panel layout.
Siding · Southworth, Washington
Siding in Southworth with open reveals needs more than a dark backing color. Ask whether the barrier behind the cladding is intended for that continuing UV exposure.
A membrane’s temporary exposure during construction and its service behind permanently open joints are different conditions. Keep the cladding geometry and the actual barrier product connected.

Siding replacement
Have the provider identify the proposed joint layout and the WRB/air-barrier product behind it. Ask for the product’s suitability and limitations for that open-joint system, including any required accessory treatment. Resolve a change in joint width or panel pattern with the responsible designer rather than assuming the same dark membrane suits every layout. Leave dimensions and installation details to the actual approved system and qualified installer.
Keep the joint pattern with the proposed exterior-panel layout.
Ask for open-joint suitability, not only a color or generic housewrap allowance.
Have revised openings and accessory details checked before the panel order or installation changes.
Before work begins
Describe the cladding, barrier and supporting wall work through the actual parcel’s DCD review. A product marketing description does not approve a complete wall assembly.
Keep current product data and the complete joint layout with the written wall proposal so a substitution can be checked before installation.
Ask for the actual product’s intended use and limitations.
Have the supplier confirm the intended long-term open-joint application separately.
Have the responsible provider check the revised assembly and product requirements.
Share the intended reveal pattern and any named product data so the estimate can identify the complete wall-system decision.