Slate Laps for varying Pitches

Slate Laps for Varying Pitches

MINIMUM RECOMMENDED LAP FOR DIFFERENT ROOF PITCHES IN MM
			Normal Exposure Driving Rain Index less than 7m2/s								Severe Exposure Driving Rain Index more than 7m2/s
			20 deg	22.5 deg	25 deg	30 deg	35 deg	40 deg	45 deg	85 deg	22.5 deg	25 deg	30 deg	35 deg	40 deg	45 deg	85 deg
Princesses	600x350	24x14	115	100	90	75	75	65	65	*	125	100	85	75	75	65	*
Duchesses	600x300	24x12	125	105	90	75	75	65	65	*	135	120	105	90	80	70	*
Small Duchesses	550x300	22x12	130	110	90	75	75	65	65	*	135	115	100	85	75	65	*
Marchioness	550x280	22x11	*	110	90	75	75	65	65	*	120	110	105	85	75	65	*
Wide Countess	500x300	20x12	115	100	90	75	75	65	65	*	120	100	80	75	75	65	*
Countess	500x250	20x10	125	105	90	75	75	65	65	50	130	115	100	90	75	65	65
	450x300	18x12	*	*	90	75	75	65	65	50	*	*	105	100	75	65	65
Wide Countess	450x250	18x10	*	*	90	75	75	65	65	50	*	*	115	110	90	65	65
Viscountess	450x230	18x9	*	*	100	75	75	65	65	50	*	*	*	105	85	65	65
	400x300	16x12	*	*	*	75	75	65	65	50	*	*	90	80	75	65	65
Wide Ladies	400x250	16x10	*	*	*	75	75	65	65	50	*	*	95	90	75	65	65
Broad Ladies	400x230	16x9	*	*	*	75	75	65	65	50	*	*	100	105	85	65	65
Ladies	400x200	16x8	*	*	*	75	75	65	65	50	*	*	105	105	90	65	65
Headers	350x250	14x10	*	*	*	75	75	65	65	50	*	*	80	75	75	65	65
Small Ladies	350x200	14x8	*	*	*	75	75	65	65	50	*	*	90	85	75	65	65
Narrow Ladies	350x180	14x7	*	*	*	75	75	65	65	50	*	*	95	90	80	65	65

Slate Sizes and Covering Capacities

			*50mm lap*					*75mm lap*					*100mm lap*
	Slate size mm	Slate size imperial	No. of slates Per sq m	Battening Gauge mm	Battens required per sq m in m	Eave slate Length in mm	Holing gauge mm	No. of slates Per sq m	Battening Gauge mm	Battens required per sq m in m	Eave slate Length in mm	Holing gauge mm	No. of slates Per sq m	Battening Gauge mm	Battens required per sq m in m	Eave slate Length in mm	Holing gauge mm
Princesses	600x350	24x14	10.2	275	3.64	330	340	10.7	263	3.81	342	353	11.3	250	4	355	365
Duchesses	600x300	24x12	11.9	275	3.64	330	340	12.5	263	3.81	342	353	13.1	250	4	355	365
Small Duchesses	550x300	22x12	13.1	250	4	305	315	13.8	238	4.21	327	328	14.6	225	4.44	330	340
Marchioness	550x280	22x11	14.01	250	4	305	315	14.76	238	4.21	327	328	15.53	225	4.44	330	340
Wide Countess	500x300	20x12	14.6	225	4.44	280	290	15.4	213	4.71	292	303	16.4	200	5	305	315
Countess	500x250	20x10	17.4	225	4.44	280	290	18.5	213	4.71	292	303	19.6	200	5	305	315
	450x300	18x12	16.4	200	5	255	265	17.5	188	5.33	267	378	18.7	175	5.71	280	290
Wide Countess	450x250	18x10	19.6	200	5	255	265	20.9	188	5.33	267	378	22.4	175	5.71	280	290
Viscountess	450x230	18x9	21.21	200	5	255	265	22.64	188	5.33	267	378	24.15	175	5.71	280	290
	400x300	16x12	18.52	175	5.71	227	240	19.87	163	6.15	240	253	21.57	150	6.67	252	265
Wide Ladies	400x250	16x10	22.4	175	5.71	227	240	24.1	163	6.15	240	253	26.1	150	6.67	252	265
Broad Ladies	400x230	16x9	24.96	175	5.71	227	240	26.35	163	6.15	240	253	28.6	150	6.67	252	265
Ladies	400x200	16x8	27.9	175	5.71	227	240	30	163	6.15	240	253	32.5	150	6.67	252	265
Headers	350x250	14x10	26.1	150	6.67	202	215	28.5	138	7.27	215	228	31.4	125	8	227	240
Small Ladies	350x200	14x8	32.5	150	6.67	202	215	35.5	138	7.27	215	228	39	125	8	227	240
Narrow Ladies	350x180	14x7	36.55	150	6.67	202	215	39.68	138	7.27	215	228	43.74	125	8	227	240

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