Roof Defects Commonly Identified During Building Surveys
The roof is one of the most important parts of any property, protecting the building from rain, wind and the wider effects of the weather. Unfortunately, it is also an area where defects can easily go unnoticed by prospective buyers.
From ground level, a roof may appear to be in reasonable condition. A closer inspection can reveal slipped tiles, deteriorated flashing, damaged chimney stacks, defective gutters and other issues that could lead to significant repair costs.
At Delamere Nicolet LLP, our surveyors assess the condition of properties to help buyers understand the building they are considering purchasing. As part of our Full Building Surveys, we use extendable pole cameras where appropriate to obtain closer views of roofs, chimney stacks, gutters and other high-level areas that can be difficult to inspect from ground level.
Common Roof Defects
Here are some of the roof defects commonly identified during building surveys.
1. Slipped, Broken or Missing Tiles
Slipped, cracked or missing tiles and slates are among the most common defects found on pitched roofs.
Even a relatively small area of damage can leave the roof vulnerable to rainwater penetration. If left unresolved, moisture entering the building may contribute to dampness, damage to internal finishes and deterioration of roof timbers.
Individual damaged tiles can be difficult to identify from pavement level, particularly on taller properties. Closer inspection of the roof covering can therefore provide valuable information about its condition.
2. Deteriorated Roof Coverings
No roof covering lasts indefinitely. Its condition will depend on factors including its age, material, exposure to the weather, quality of installation and previous maintenance.
Older tiles and slates may become cracked, displaced or deteriorated. Some roofs may also show evidence of previous patch repairs, which can indicate areas where problems have occurred in the past.
A surveyor can assess the visible condition of the roof covering and highlight areas where repairs, maintenance or eventual replacement should be anticipated.
3. Defective Flashing
Flashing is used to help prevent water entering a building at vulnerable roof junctions, including around chimney stacks, roof abutments, dormers and valleys. Over time, flashing can deteriorate, become displaced or fail. Poorly installed repairs can also create weak points where rainwater is able to penetrate.
Signs of a problem may include dampness or staining within the roof space or on ceilings and walls beneath the affected area. Because flashing is often located high above ground level, our extendable pole cameras can be particularly useful in obtaining closer views of these areas during a Full Building Survey where conditions allow.
4. Chimney Stack Defects
Chimney stacks are prominent features of many older properties and are particularly exposed to the weather. Common defects include deteriorated pointing, damaged masonry, defective flashing, loose or damaged chimney pots and evidence of previous repairs. Problems affecting a chimney stack should not be overlooked. Even relatively localised repairs can involve scaffolding or specialist access, potentially increasing the overall cost of the work.
Using an extendable pole camera can help our surveyors obtain a closer view of visible chimney defects that may be difficult to assess adequately from ground level.
5. Problems With Gutters and Downpipes
Gutters and downpipes perform the important job of directing rainwater away from the building. Blocked gutters, leaking joints, damaged sections and poor alignment can cause water to overflow onto external walls. Persistent saturation can contribute to dampness, staining and deterioration of masonry or external finishes.
Vegetation growing from a gutter is an obvious indication that maintenance may be overdue, but less visible defects can also cause problems. High-level gutters can be difficult to assess from below, making closer inspection particularly useful when considering the condition of the property’s rainwater goods.
6. Inadequate Roof Ventilation
Ventilation is an important consideration within many roof spaces.
Warm, moisture-laden air from the occupied parts of a property can enter the roof void. If there is insufficient ventilation, condensation may form on cold surfaces. Persistent condensation can contribute to mould growth, damp insulation and deterioration of timber components.
Where the roof space is safely accessible, a surveyor can look for visible evidence of condensation and consider whether ventilation appears adequate.
7. Damaged or Deteriorating Roof Timbers
The condition of the roof covering is only part of the picture. The structure supporting it is equally important.
Where safe and accessible, inspection of the roof space can reveal evidence of moisture penetration, decay, previous leaks or deterioration affecting visible roof timbers. Surveyors may also identify alterations to the roof structure. Timbers can sometimes have been cut, removed or modified during previous building works, such as loft conversions or the installation of water tanks and other services.
Where significant concerns are identified, further specialist investigation may be recommended.
8. Inadequate or Poorly Installed Insulation
Roof insulation can have a significant effect on both energy efficiency and the performance of the roof space.
During a survey, insulation may be found to be insufficient, unevenly distributed or incorrectly installed. In some circumstances, insulation can obstruct ventilation routes, potentially increasing the risk of condensation.
Large amounts of insulation can also conceal parts of the ceiling structure beneath it. As a building survey is a non-invasive inspection, concealed areas cannot normally be inspected without disturbing the property.
9. Flat Roof Defects
Flat and low-pitched roofs require particular attention because they rely on effective drainage to prevent water from remaining on the surface. Common defects can include cracking, blistering, deteriorated joints, defective edges and inadequate falls. Ponding water may also indicate that the roof is not draining effectively.
Junctions between a flat roof and adjoining walls, outlets and other penetrations can be particularly vulnerable to water ingress.
Understanding the approximate age and visible condition of a flat roof can help buyers anticipate possible future maintenance or replacement costs.
10. Evidence of Previous Leaks
Water staining within a roof space or on ceilings does not necessarily mean that the roof is currently leaking. It may be evidence of a historic problem that has already been repaired. However, signs of previous water penetration should not simply be ignored.
A surveyor will consider the location and appearance of staining alongside the visible condition of the roof. Where the source cannot be established, or there are indications that moisture penetration may still be occurring, further investigation may be appropriate.
11. Poorly Executed Roof Alterations
Roof structures are sometimes altered to accommodate loft conversions, rooflights, extensions, services or other improvements. While many alterations are carried out correctly, a survey may reveal evidence of inappropriate cutting or removal of structural timbers, inadequate support or poor-quality workmanship.
Alterations can also create new junctions and potential weak points in the roof covering, particularly around rooflights, dormers and extensions. Where significant alterations have been undertaken, buyers may also wish to ask their legal adviser to investigate the relevant approvals and documentation.
Why Roof Defects Matter When Buying a Property
Roof defects can vary enormously in their significance. Replacing a small number of damaged tiles may be relatively straightforward. More extensive problems involving the roof covering, structural timbers, chimney stacks or persistent water penetration can involve considerably greater expenditure.
Access is another important consideration. Work at roof level may require scaffolding, specialist equipment or other access arrangements, meaning the cost of carrying out repairs can sometimes be significantly greater than the apparent size of the defect might suggest.
It is also important to recognise that one defect can lead to another. A damaged roof covering may allow water into the building, for example, which can subsequently cause deterioration to timbers, insulation, ceilings and internal finishes.
Identifying visible roof problems before purchasing can therefore help you understand the property’s condition and plan for potential repairs and future maintenance.
Getting a Better View With Extendable Pole Cameras
Roofs can be challenging to inspect because of their height, pitch and design. A conventional ground-level inspection may not always provide a sufficiently clear view of roof coverings, chimney stacks, flashings, valleys and gutters.
As part of our Full Building Surveys, Delamere Nicolet LLP uses extendable pole cameras where appropriate to obtain closer views of areas that might otherwise be difficult to inspect.
Mounted on a long extendable pole, the camera can be raised towards high-level areas while the surveyor remains at ground level. This can provide useful close-up images of visible defects and areas requiring further attention.
Depending on the property and accessibility, this may help our surveyors identify:
- slipped, cracked or missing tiles and slates;
- deteriorated chimney masonry and pointing;
- defective or displaced flashing;
- blocked or damaged gutters;
- defects around valleys and roof junctions; and
- evidence of previous roof repairs.
This approach can be particularly useful when inspecting taller and older properties.
Why We Don’t Always Rely on Drones
Drones can be useful surveying tools in the right circumstances, particularly where a large or otherwise difficult-to-view roof needs to be assessed. However, they are not always the most practical option for a residential building survey.
Weather is an obvious consideration. Wind and rain can restrict when a drone can be operated safely and effectively, potentially making it difficult to use on the day a survey has been arranged.
The surroundings also matter. Many residential properties are located close to neighbouring houses, gardens, roads, trees and other obstacles. Operating a drone can introduce additional practical considerations that simply do not arise to the same extent when using a pole-mounted camera.
There is also the issue of noise and disruption. Although relatively small, drones create noticeable noise and their presence above or close to neighbouring properties may attract attention. In a densely populated residential area, this can cause unnecessary disturbance or concern for neighbours.
Privacy and proximity to neighbouring properties also need careful consideration. A camera-equipped drone operating above a residential area can understandably attract questions from people living nearby, even when it is being used for a legitimate professional purpose.
Drone operations are also subject to applicable aviation rules and operational restrictions, meaning their use needs to be considered in the context of the individual property and location.
For our Full Building Surveys, an extendable pole camera provides a straightforward and less intrusive way of obtaining useful close-up images of high-level building elements.
Why Pole Cameras Can Be Better Suited to Residential Surveys
For many typical residential properties, we find that extendable pole cameras offer several practical advantages.
There is no drone flying overhead and considerably less disturbance to neighbours. The equipment can be deployed quickly where site conditions permit, and the surveyor retains direct control over the position of the camera while inspecting particular elements of the building.
A pole camera can also be particularly useful when the surveyor wants to concentrate on a specific area , such as chimney flashing, a section of guttering or a group of suspicious roof tiles, and obtain closer images to support the visual inspection.
Technology Supporting Professional Judgement
Whether inspecting from ground level, within a roof space or using an extendable pole camera, technology is only part of the surveying process. Images still need to be considered in the context of the building as a whole.
A displaced tile, deteriorated flashing or stained roof timber can provide an important clue, but the surveyor must consider what it means, whether other defects are associated with it and whether repairs or further investigation should be recommended.
At Delamere Nicolet LLP, our use of extendable pole cameras during Full Building Surveys is intended to complement the surveyor’s professional inspection and provide additional visual information where appropriate.
The Value of a Full Building Survey
A property can look extremely well maintained during a viewing while still having defects that are difficult for a prospective buyer to identify.
Our Full Building Surveys are designed to provide a detailed assessment of the visible condition of a property. The inspection considers the building as a whole rather than focusing only on obvious defects.
By using equipment such as extendable pole cameras where appropriate, we can obtain closer views of certain high-level areas and provide buyers with additional information about parts of the building that can otherwise be challenging to assess. The purpose of a survey is not simply to produce a list of defects. It should help you understand their potential significance, identify areas requiring maintenance or further investigation and give you a clearer picture of the property you are considering buying.
Buying a Property? Speak to Delamere Nicolet LLP
A roof that looks satisfactory from the pavement may still contain defects that could lead to unexpected repair and maintenance costs after you move in.
At Delamere Nicolet LLP, our surveyors help property buyers understand the condition of their prospective homes before making a major financial commitment.
As part of our Full Building Surveys, we use extendable pole cameras where appropriate to obtain closer views of roofs, chimney stacks, gutters and other difficult-to-view high-level areas. For many residential properties, this provides a practical and less intrusive alternative to relying on a drone, without unnecessary noise or disruption to neighbouring properties.
If you are buying a property, contact Delamere Nicolet LLP to discuss our Full Building Survey service and how we can help you gain a clearer understanding of the building before you proceed.
This article is intended for general information only. The construction, condition and accessibility of roofs vary considerably between properties. Inspection methods are subject to access, site conditions, weather and safety considerations, and further specialist investigation may be recommended where appropriate.