SAVE this for your next window buck install with ROCKWOOL Comfortboard to get the perfect fit and airtight assembly. Start with these steps: 💭 Choose your insulation thickness based on thermal requirements 📏 Calculate the combined thickness of the insulation and furring strips 🪚 Cut the window buck to match this measured thickness 🙌 Position the window buck so the flange aligns with the furring strips 🔩 Secure the window buck in place, ensuring the flange sits flush against the furring stri