search.noResults

search.searching

dataCollection.invalidEmail
note.createNoteMessage

search.noResults

search.searching

orderForm.title

orderForm.productCode
orderForm.description
orderForm.quantity
orderForm.itemPrice
orderForm.price
orderForm.totalPrice
orderForm.deliveryDetails.billingAddress
orderForm.deliveryDetails.deliveryAddress
orderForm.noItems
EXTERNAL ENVELOPE


Shedding light on the case for rooflights


Rooflights are now an essential element to consider in modern designs, says John Godley of Hambleside Danelaw Building Products, explaining the reasons why


ooflights play a vital role in the modern building, but are often overlooked. They are the common link to many aspects of building design and can help the designer, the building owner and the occupier achieve a more sustainable, energy efficient and enjoyable place to work and to live in. Well considered rooflight design, done at the outset of the building concept can have dramatic effects on all aspects of the building from the owner’s potential asset value to the well-being and productivity of the occupants.


R


Buildings that provide high levels of natural light are more positive working environments than those which are dependent upon artificial light. It is known that people respond better to working in natural light conditions, as the eye and brain functions work better, resulting in improved concentration and overall performance. Plus, of course, less dependency on artificial light significantly reduces energy consumption and running costs as well as impacting positively on a building’s overall carbon footprint. In new buildings, where high levels of insulation are now being installed, the most significant savings in energy can be realised through the utilisation of the free resource that is natural daylight. The energy consumed by artificial lighting far exceeds the relatively small amounts of heat energy that are lost through increasing the rooflight area, which is a small part of the whole building fabric. The amount of energy required to light a well-insulated building is far greater than the amount of energy required to heat it, and can be the greatest single energy use in the operating the building. Of course, artificial lighting will always be essential in most occupied buildings subject to requirements, particularly in the


winter months or in areas where localised specific or constant lighting levels are required, but even low energy lighting systems can create relatively high energy demands. This is even more likely when the lighting is turned on and left on throughout the daylight hours irrespective of need, and where automated lighting controls have not been incorporated into the design. Thermally efficient insulated rooflights can further reduce heat loss and energy consumption. The effectiveness of rooflights as a contributor to energy efficiency are acknowledged in the Building Regulations Approved Document Part L. It recommends that industrial and commercial building structures should have a rooflight area of 10 per cent to 20 per cent, subject to limit- ing solar gains. Research by De Montfort University and published by the National Association of Rooflight Manufacturers (NARM) demonstrates the savings that can be made by increasing rooflight areas. The graph below demonstrates the


reduction in CO2 emissions of a typical notional building as the rooflight area is increased to the optimum 16 per cent to 18 per cent, and used in conjunction with a fully automated lighting control system.


In new buildings, where high levels of insulation are now being installed, the most significant savings in energy can be realised through the utilisation of the free resource that is natural daylight


61


ADF NOVEMBER 2018


WWW.ARCHITECTSDATAFILE.CO.UK


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84