Questions About Mounting and Waterproofing Worth Raising Before Installation

A solar array becomes part of a roof as soon as the mounting system is selected. The panels are visible, but the questions that protect the roof are usually underneath them: what the fixing attaches to, how the load reaches the supporting structure, how rainwater moves around a penetration, and who checks the detail before the work is signed off.

Start with the roof that is already there

A roof photo can help a consultant see the broad arrangement of roof planes, vents and existing panels. It cannot establish the condition of concealed framing, the strength of a fixing point or the history of a leak. A useful first conversation therefore covers the roof material, pitch, age, previous repairs, visible water marks, access routes and any planned reroofing.

The U.S. Department of Energy Building America Solution Center places roof material, slope, weatherproofing, installation convenience and loading among the factors to consider when choosing an anchoring system [1]. That is a technical reference for the questions to raise, not a Malaysian code verdict for an unnamed property.

Make the attachment path visible

Ask for a roof-specific drawing or marked-up proposal that shows the intended rail, bracket or mounting points. The important point is not to prescribe one fixing method from a website. It is to make the load path discussable: where the attachment lands, which part of the roof carries it, how the chosen system matches the roof covering, and how access to vents, drainage paths and maintenance areas is kept practical.

Malaysia’s current Energy Commission guideline for solar PV installation for self-consumption was revised in June 2026. It applies to people involved in the design, installation, testing, commissioning and maintenance of a self-consumption solar PV installation, and its application material includes a declaration that the site condition is fit for the installation [3]. For a homeowner, the practical question is simple: which qualified person is responsible for each part of the assessment, and where is that conclusion recorded?

Treat waterproofing as a roof detail

Where a mounting point penetrates a roof, the detail needs to work with the roof’s existing water-control layers. The Building America guidance describes flashing and sealing around penetrations, with water-control materials arranged so that drainage continues away from the building [1]. It also warns against treating sealant alone as the whole weatherproofing strategy.

That does not mean every roof receives the same flashing product or the same sequence. Ask what happens at each penetration, whether the proposed materials are compatible with the roof covering and manufacturer instructions, how an existing defect will be handled, and how the finished area will be inspected. Avoid accepting a general promise that a roof is “waterproof” without a written, roof-specific scope.

Questions worth putting into the proposal

These questions keep the conversation concrete without pretending that a remote photo can approve an installation:

• What roof type and condition were used for the proposed mounting approach?
• Where will each attachment transfer load, and what part of the supporting structure is being relied on?
• Which flashing, seal and water-control detail is planned at every roof penetration?
• What happens if a tile, sheet, ridge, valley or existing roof defect needs repair before installation?
• How will roof drainage, vents, safe access and future maintenance remain clear?
• Who is responsible for the structural, roofing and electrical parts of the work, and what will each person sign or hand over?
• Which drawings, installation photographs and maintenance notes will be supplied after completion?

A proposal should leave a written trail

Inhome Solar publicly lists solar system installation, documentation and TNB application support, operations and maintenance, and consultancy advisory among its services [4]. Its public project material is useful for understanding the kind of installation conversation a buyer may have, but it does not prove the hidden roof details of any unnamed property [5].

Before work begins, keep the roof-specific scope with the proposal. After work, ask for the final layout, any changes made on site, the products or instructions relevant to the mounting detail, and the information needed for future inspection. The goal is not to turn a homeowner into a structural engineer. It is to make the important questions answerable by the people responsible for the work.

Sources used

Publisher: Inhome Solar Sdn Bhd · Updated: 18 September 2026 · Technical suitability, structural work, installation details and any applicable approval remain subject to the responsible qualified professionals and the conditions of the property.